Posted on

Pearls Normative Clauses

Pearls Normative Clauses

wholesale pearls4.1. General
Pearls (5.118), cultured pearls (5.48), composites (5.42) and imitation pearls (5.84) shall be named and described in accordance with the definitions, clauses and annexes herein. This applies to descriptions in all publications and communications addressed to the public as well as to all commercial documents (e.g., advertisements, offers, labels, memos, delivery notes and invoices) and to appraisals.

4.2. Biological name
Pearls (5.118) and cultured pearls (5.48) that are not listed in Annex A or defined in (5 or 6) shall be described by the biological name of the mollusc from which they originate only.
NOTE: Biological name of the natural or cultured pearl may be used to correctly identify the natural or cultured pearl instead of the commercial name (Annex A). Use the descriptive adjective for the natural pearl or cultured pearl, if any is needed, as indicated in Annex A.
NOTE: the correct biological name preceded or followed by a colour description may substitute for any commercial name.

4.3. Approval of commercial names
all commercial names not listed in Annex A, whether new or old, shall be submitted to CIBJO for approval and inclusion within this standard or these rules.

4.4. The term „cultured‟
the term ‗cultured‘ (5.46 and 5.48) shall only be used for cultured pearls (5.48).
NOTE: the placing of an asterisk next to the word pearl making reference to a footnote explanation of the fact the product is a cultured pearl does not comply with this clause.

wholesale pearls south sea pearls wholesale
If you looking for Wholesale Pearls & South Sea Pearls Wholesale, please contact us on phone or whatsapp +6287865026222 (Miss Joaquim Pearls Indonesia)

4.5. Display
when pearls (5.118), cultured pearls (5.48), composites (5.42) and imitation pearls (5.84) are displayed for sale all clauses within this standard/rules shall apply. In cases where not all displays are devoted exclusively to pearls (5.118), cultured pearls (5.48), composites (5.42) and imitation pearls (5.84), or where jewellery is not decorated exclusively with pearls (5.118), cultured pearls (5.48), composites (5.42) and imitation pearls (5.84) but contains one of these products, an easily noticeable label shall clearly indicate the precise nature of the objects being shown. For any piece of jewellery on display that is composed of pearls (5.118) as well as cultured pearls (5.48), composites (5.42) or imitation pearls (5.84), an easily noticeable and legible label adjoining each piece of jewellery shall clearly indicate the details of its composition in accordance with the clauses herein.

4.6. Geographical area
the names of specific geographical areas shall only be used to refer exclusively to pearls and or cultured pearls which are found or grown exclusively from that area e.g., ‗‗Biwa Cultured Pearl‘‘ (5.17) shall only be used to describe cultured pearls grown in freshwater bivalve molluscs in Lake Biwa, Japan, etc, unless the name of the geographical area is part of the commercial name as listed in Annex A, e.g., South Sea Cultured Pearl (5.165), etc.

4.7. The use of terms
Only those pearls that conform to the definition contained in 5.118 shall be described as natural pearls and only those pearls that conform to the definition contained in 5.48 shall be described as cultured pearls and all descriptions for pearls and cultured pearls shall conform to the content of all other clauses herein.

4.7.1. „Assembled/composite‟
Assembled/Composite cultured pearls shall be described by the words composite or assembled according to the composite construction (except when they can be defined as an imitation (5.84) and shall, prior to the closing of the sale, require a verbal explanation that it is an assembled/composite pearl product, and, in the event of a written presentation, shall be immediately preceded by the correct names of the components of the assembled product, the names of which shall be mentioned from the upper part downwards and be separated by a slash (/). Except where all parts of the assembled/composite pearl products are of the same substance (excluding any cement) when the name of this substance shall be stated only once. Do not abbreviate. The terms assembled or composite, in the event of a written presentation, shall appear with equal emphasis and prominence, with characters of the same size and colour as those of the names of the components. Do not abbreviate. If an assembled/composite cultured pearl can be purchased without personally viewing the product, (e.g., direct mail, catalogues, online services, televised shopping programs, etc.) explanation shall be made that it is an assembled/composite pearl in the presentation and/or in the description of the product prior to the close of the sale.
NOTE: The placing of an asterisk next to any name or combination of names of a pearl, making reference to a footnote explanation of the fact that the product is an assembled/composite, does not comply with the requirements of this clause. Do not use a qualifying title other than ‗assembled‘ or ‗composite‘ to describe any product classified under (4.7.1).

4.7.2. „Cultured‟
the term ‗cultured‘ shall only be used for cultured pearls (5.48). This applies to all cultured pearls, whichever method or body of water is used for their formation.

4.7.3. „Freshwater cultured pearl‟
the term ‗freshwater cultured pearl‘ (5.65) shall always be used for cultured pearls that have been cultured in freshwater rivers, lakes and ponds. When making reference to a freshwater cultured pearl, the words ‗cultured pearl‘ shall immediately be preceded by the word ‗freshwater‘ and shall, prior to the closing of the sale, require a verbal explanation that it is a freshwater cultured pearl, and in the event of a written presentation, shall immediately be preceded by the word ‗freshwater‘, with equal emphasis and prominence, with characters of the same size and colour as those of the name itself. Do not abbreviate. If a freshwater cultured pearl can be purchased without personally viewing the product, (e.g., direct mail, catalogues, online services, televised shopping programmes) explanation shall be made that it is a freshwater cultured pearl in the presentation and/or description of the product prior to the close of the sale.
NOTE: The placing of an asterisk next to the name of a freshwater cultured pearl, making reference to a footnote explanation of the fact that the product is a freshwater cultured pearl, does not comply with the requirements of this clause.

4.7.4. „Freshwater natural pearl‟
the term ‗freshwater (5.64) natural pearl‘ (5.118) shall only be used to describe natural freshwater pearls (5.66).

4.7.5. Natural Pearl
The term natural pearl shall only be used to describe natural pearls (5.118) i.e., pearls produced naturally within a natural pearl sac (5.119) and without any human intervention.

4.7.6. „Oriental pearl‟
the term ‗oriental pearl‘ (5.131) shall only be used for natural saltwater pearls (5.155, 5.118) and shall not be used to denote the quality or appearance of a pearl.

4.7.7. „Pearl‟
If the word “pearl” (5.135) is used without qualification within a commercial document it shall be understood that the item being referred to is a “natural pearl”. However, to avoid confusion and /or misinterpretation in commercial documents, it is recommended that natural pearls be labelled as “natural pearls‖. The term “pearl” as used in the jewellery industry shall always be preceded with the term “cultured” for cultured pearls or the term “imitation” for imitations of natural pearls and cultured pearls in commercial documents.It is understood that the term ‗pearl‘ is not generic when used in the trade and as described in the previous paragraph, even if the term is used in a broader sense within the public domain.
The unqualified term “pearl” shall not be used when referring to an imitation or simulant of a pearl in either commercial or non-commercial documents.

4.7.8. „Saltwater cultured pearl‟
the term ‗saltwater cultured pearl‘ (5.48) shall always be used for cultured pearls cultured in bodies of saltwater. When making reference to a saltwater cultured pearl, the words ‗cultured pearl‘ do not need to be preceded by the word ‗saltwater‘ but shall, prior to the closing of the sale, require a verbal explanation only that it is a cultured pearl, this applies also in the event of a written presentation. Do not abbreviate. If a saltwater cultured pearl can be purchased without personally viewing the product, (e.g., direct mail, catalogues, online services, televised shopping programmes) explanation shall be made that it is a cultured pearl in the presentation and/or description of the product prior to the close of the sale.
Note -The placing of an asterisk next to the name of saltwater cultured pearl, making reference to a footnote explanation of the fact that the product is saltwater cultured pearl, does not comply with the requirements of this clause.

4.7.9. “Cut cultured pearls”
cultured pearls (5.48) that have been cut (5.50) shall be clearly described as half or three quarter cut cultured pearls.

4.7.10. “Assembled/Composite cultured blister”
Assembled/Composite cultured blisters shall be named and described in accordance with (5.8 and 5.49) and all other clauses herein.

4.7.11. “Assembled/Composite cultured pearls”
Assembled/Composite cultured pearls shall be named and described in accordance with (5.7) and all other clauses herein.
NOTE: The terms ‗assembled‘ or ‗composite‘ may be used interchangeably.
Articles source: THE PEARL BOOK, Natural, Cultured, Composite & Imitation Pearls — Terminology & Classification (Including information on modifications), 2013-08-12, CIBJO/Pearl Commission.
south sea pearls wholesaleFor Questions and answer you can contact & chat with us on:

  • Phone : +6287865026222
  • Facebook Massager click below :
  •  facebook.com/mutiaralomboktourpearlwholesale
  • Twitter : @abdurrachim
  • WhatsApp : +6287865026222
  • Email to: abdurrachim@gmail.com
  • Telegram id : mutiarapearl
  • LINE id : chatinmyline
  • wechat id: chatwechat

We send your parcel via FedEx

abdurrachim miss joaquim pearl send via fedex 1
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

abdurrachim pearl fedex
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

This is my name, my phone number and my address, as a sender (written by FedEx)
This is my name, my phone number and my address, as a sender (written by FedEx)

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

one sample of inside the box of parcels abdurrachim missjoaquim pearl
one sample of inside the box of parcels

Related Articles:

Posted on

Price of natural pearls & Natural, Cultured, Composite and Imitation Pearls – Terminology and Classification (nomenclature)

Natural, Cultured, Composite and Imitation Pearls – Terminology and Classification (nomenclature)

wholesale pearls1. Scope
The terminology and classification (nomenclature) for pearls (5.118), cultured pearls (5.48), composites (5.42) and imitation pearls (5.84) are established with reference to commercial usage and are in conformity with the practices of the international natural, cultured and imitation pearl trade. The terminology and classifications (nomenclature) of natural, cultured and imitation pearls as set out herein shall be used by all traders participating as members of CIBJO member organizations within all member nations.
NOTE – CIBJO recognises that its standards are subject to government regulations in the respective jurisdiction of CIBJO members. ( price of natural pearls )

price of natural pearls
price of natural pearls

2. Normative references

  • The Diamond Book, CIBJO, International Confederation of Jewellery, Silverware, Diamonds, Pearls and Stones), the World Jewellery Confederation, S.S. Del Sempione KM.28 20017 RHO Milano, Italy. cibjo@cibjo.org. ( price of natural pearls )
  • The Gemstone Book, CIBJO (International Confederation of Jewellery, Silverware, Diamonds, Pearls and Stones), the World Jewellery Confederation, S.S. Del Sempione KM.28 20017 RHO Milano, Italy. cibjo@cibjo.org. ( price of natural pearls )
  • The Precious Metal Book, CIBJO (International Confederation of Jewellery, Silverware, Diamonds, Pearls and Stones), the World Jewellery Confederation, S.S. Del Sempione KM.28 20017 RHO Milano, Italy. cibjo@cibjo.org. ( price of natural pearls )
  • The Gemmological Laboratory Book, A Guide for the Management and Technical Operations of Gemmological Laboratories, CIBJO (International Confederation of Jewellery, Silverware, Diamonds, Pearls and Stones), the World Jewellery Confederation, S.S. Del Sempione KM.28 20017 RHO Milano, Italy. cibjo@cibjo.org
  • Convention on International Trade in Endangered Species of Wild Fauna and Flora, Appendices I, II and III valid from 22 May 2009. International Environment House • Chemin des Anémones • CH-1219 Châtelaine, Geneva, Switzerland, info@cites.org.
  • ( price of natural pearls )

3. Pearl Categories
The jewellery industry and trade shall recognize four categories of pearl:
(a) The rare natural pearls (5.118) that are produced naturally by various saltwater (bi-valve and univalve) and freshwater molluscs.
Articles source: THE PEARL BOOK, Natural, Cultured, Composite & Imitation Pearls — Terminology & Classification (Including information on modifications), 2013-08-12, CIBJO/Pearl Commission. ( price of natural pearls )
south sea pearls wholesaleFor Questions and answer you can contact & chat with us on:

  • Phone : +6287865026222
  • Facebook Massager click below :
  •  facebook.com/mutiaralomboktourpearlwholesale
  • Twitter : @abdurrachim
  • WhatsApp : +6287865026222
  • Email to: abdurrachim@gmail.com
  • Telegram id : mutiarapearl
  • LINE id : chatinmyline
  • wechat id: chatwechat

We send your parcel via FedEx

abdurrachim miss joaquim pearl send via fedex 1
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

abdurrachim pearl fedex
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

This is my name, my phone number and my address, as a sender (written by FedEx)
This is my name, my phone number and my address, as a sender (written by FedEx)

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

one sample of inside the box of parcels abdurrachim missjoaquim pearl
one sample of inside the box of parcels

Related Articles:

Posted on

Pearl Necklace Wholesale : CARE OF PEARLS

Pearl Necklace Wholesale : CARE OF PEARLS

Pearl Necklace WholesalePearls are products of living organisms and thus react strongly to acids and chemicals, including those in perfumes, soaps, and hairsprays. Because soaps and dish-washing detergents that contain bleaching agents may discolor pearls, it is particularly important that rings containing black pearls be removed before immersion of the hands in these solutions.

To avoid dehydration and cracking due to dryness, some members of the trade recommend rubbing pearls with a dab of a natural oil placed on a soft cloth; this will also enhance the pearl’s beauty and luster. Historically, sandalwood oil has been preferred for this purpose (C. Rosenthal, pers.
comm., 1989). (Detail info: Pearl Necklace Wholesale)

Pearl Necklace Wholesale
If you looking for Wholesale Pearls & South Sea Pearls Wholesale, please contact us on phone or whatsapp +6287865026222 (Miss Joaquim Pearls Indonesia)

(Foto & Detail info: Pearl Necklace Wholesale)

Because pearls are not very hard-only 3.5 on the Mohs scale – they can be scratched fairly easily. In manufacturing, it is recommended that the jeweler not place the pearls in a design where they will rub against other gems or metal or will be in a position of tension with a metal, such as in a prong setting. In storing pearls, it is best to keep them separate from other jewelry and wipe them with a soft cloth after wear. (Detail info: Pearl Necklace Wholesale)

CONCLUSION by Pearl Necklace Wholesale

Polynesian cultured black pearls have been called the “rainbow gem of the 20th century” (Salomon and Roudnitslza, 1986). Indeed, the development of the black-pearl Industry in the 1960s has now made the worldwide distribution of natural color cultured Black pearls feasible. Without this technology, blaclz pearls would have remained the oddity they were for the first 70 years of this century. Technology has also given the major gemological and pearl-research laboratories the tools by which to separate natural-color blaclz pearls from most of their treated counterparts. (Detail info: Pearl Necklace Wholesale)

Today, cultured blaclz pearls are seen in fine jewelry stores everywhere. Given the level of government support and the broad scope of the pearl-culturing industry in French Polynesia, it appears that there will continue to be a steady supply of these attractive gems in the future. (Detail info: Pearl Necklace Wholesale)

Articles source: POLYNESIAN BLACK PEARLS, By Marisa Goebel and Dona Mary Dirlam (Detail info: Pearl Necklace Wholesale)
Pearl Necklace WholesaleFor Questions and answer you can contact & chat with us on:

  • Phone : +6287865026222
  • Facebook Massager click below :
  •  facebook.com/mutiaralomboktourpearlwholesale
  • Twitter : @abdurrachim
  • WhatsApp : +6287865026222
  • Email to: abdurrachim@gmail.com
  • Telegram id : mutiarapearl
  • LINE id : chatinmyline
  • wechat id: chatwechat

We send your parcel via FedEx

abdurrachim miss joaquim pearl send via fedex 1
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

abdurrachim pearl fedex
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

This is my name, my phone number and my address, as a sender (written by FedEx)
This is my name, my phone number and my address, as a sender (written by FedEx)

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

one sample of inside the box of parcels abdurrachim missjoaquim pearl
one sample of inside the box of parcels
Related Articles:

Posted on

DISTRIBUTION OF POLYNESIAN BLACK PEARLS

DISTRIBUTION OF POLYNESIAN BLACK PEARLS

wa mj ar pearls wholesaleCurrently culturing in Polynesia is carried out on privately owned pearl farms like the Rosenthals’ or on pearl cooperatives. While there are many farms that produce less than 200 pearls annually, 24 farms have an annual production of over 5,000 cultured pearls. The farms tend to be more successful than the cooperatives because of the financial resources with which they are backed.

The cooperatives were established in 1971 by the Fisheries with loans from the Societe de Credit d Oceanie (SOCREDO) so that each atoll would have its own pearl-culturing industry. In 1988, there were approximately 40 cooperatives with 1,145 members. These cooperatives were reorganized in 1989 into 157 smaller family groups in an effort to improve production [M. Coeroli, pers. comm., 1989).

wholesale pearls south sea pearls wholesale
If you looking for Wholesale Pearls & South Sea Pearls Wholesale, please contact us on phone or whatsapp +6287865026222 (Miss Joaquim Pearls Indonesia)

The cultured pearls are sold either through private sales or auctions. Most of the material produced on the farms is sold privately to pearl wholesalers and major jewelry companies. However, approximately 40% of the total production each year is sold at auction. Auctions are usually held once a year, in October. They are coordinated by EVAAM and GIE Poe Rava Nui, the two government agencies that oversee the pearl-culturing cooperatives (M. Coeroli, pers. comm,, 19891. These pearl auctions give the cooperatives the opportunity to help repay their government loans. They have also been important in making the international public and jewelry community more aware of Polynesian cultured black pearls.

The auctions are held in private, by invitation only, in Papeete, Tahiti. At the 1988 auction, 107 participants (co-ops and independent farms) presented their goods to an invited audience. The pearls were divided into lots of different pearl sizes and quantities. After examining the various pearls in a lot, buyers make specific offers for the particular lots in which they are interested. At the 1988 sale, approximately 70 lots were offered, with total sales exceeding $2 million (almost 10 times the total amount exported the first year the auction was held, 1981). In addition, 515 kg of “lzeshi” pearls, a by-product of culturing (figure 21), were sold (Cazassus, 1989).

In 1984, the principal buyers at auction were:

  • Japanese, 30%;
  • U.S., 30%; and
  • Swiss, 30%; with
  • France and other countries, 10%.
  • By 1988, the market was such that 84% of the production sold at auction went to Japanese buyers, with the remainder sold primarily to Tahitian jewelers [Cazassus, 1989).

It is important to remember that natural-color cultured black pearls have been commercially available for less than 20 years. Production has risen rapidly during this period (table 1)) yet it appears that demand still exceeds supply. In Japan, in particular, demand increased sharply in the second half of 1988 and continues to rise [Chun, 1989)

MARKETING

The great popularity of black pearls today can be directly attributed to the marketing efforts of two large companies, Assael International and Golay Buchel Inc. ‘almost single-handedly popularized the natural color Tahitian black pearl” (Federman, 1987). In the 1960s, he worked with Jean-Claude Brouillet, owner of the S. Marutea Atoll, to develop a viable black-pearl culturing operation. Eventually, they produced as many as 22,000 cultured pearls per harvest. Backed by this production, in the early pearls directly to the jewelry industry, bypassing the traditional Japanese distribution system. Not only did he and Brouillet promote their pearls to tourists throughout French Polynesia, but they also wrote articles, placed advertisements in magazines around the world, and convinced major companies such as Harry Winston and Van Cleef and Arpels to include black cultured pearls in their inventories of fine jewels (figure 22).

Today, Assael continues to be a major force in the marketing of blaclz cultured pearls, along with other distributors
such as Golay Buchel, who plays the prominent role in the important Japanese market (A. Goetz, pers. comm., 1989).
Another key factor in raising the public’s awareness of black pearls has been the jewelry auctions held by Christie’s and Sotheby’s. In 1969, a three-row strand of 141 blaclz pearls sold for $168,000. Ever since, single pearls or pearl necklaces have been a routine item in the “magnificent jewelry” auctions. In October 1988, a double strand of blaclz and gray cultured pearls sold at Sotheby’s New York for $649,000 (figure 23). The threestrand necklace in figure 1 sold for $880,000 at Christie’s October 24, 1989, auction in New York.

Pearls are marketed in Tahiti through different jewelry stores, some owned by the pearl producers themselves. For example, the Tahiti Pearl Center and Museum in Papeete is owned by Robert Wan, currently the largest producer of blaclz cultured pearls. The museum not only sells pearl jewelry, but also educates through videos, photos, and displays. Most hotels display pearls and pearl jewelry, thus exposing travelers to the gem.

Articles source: POLYNESIAN BLACK PEARLS, By Marisa Goebel and Dona Mary Dirlam
south sea pearls wholesaleFor Questions and answer you can contact & chat with us on:

  • Phone : +6287865026222
  • Facebook Massager click below :
  •  facebook.com/mutiaralomboktourpearlwholesale
  • Twitter : @abdurrachim
  • WhatsApp : +6287865026222
  • Email to: abdurrachim@gmail.com
  • Telegram id : mutiarapearl
  • LINE id : chatinmyline
  • wechat id: chatwechat

We send your parcel via FedEx

abdurrachim miss joaquim pearl send via fedex 1
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

abdurrachim pearl fedex
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

This is my name, my phone number and my address, as a sender (written by FedEx)
This is my name, my phone number and my address, as a sender (written by FedEx)

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

one sample of inside the box of parcels abdurrachim missjoaquim pearl
one sample of inside the box of parcels
Related Articles:

Posted on

Wholesale Pearl Necklaces : Modern Pearl Identification

Wholesale Pearl Necklaces : Modern Pearl Identification

Wholesale Pearl NecklacesIn 1920, Rosenthal recommended a relatively simple method for identifying dyed pearls: “When a [natural] blaclz pearl is scraped, the powder is white, but in the case of an artificially colored pearl, the powder is black.” While this procedure is accurate for some dyed pearls, it is also destructive. Similarly successful experiments in the 1970s with a Vickers hardness machine- (komatsu and Alzamatsu, 1978) were never adapted for routine testing because of their destructive nature. Today, because of the sophisticated equipment and experience needed to identify treatment, definitive pearl testing requires the resources of a well-equipped gemological or pearltesting laboratory. ( source : Wholesale Pearl Necklaces )

Currently gemologists at most Western gemological laboratories commonly use long-wave U.V fluorescence, X-ray fluorescence, X-radiographs, visual observation, and microscopic examination to separate treated from natural- color pearls. These tests are often used in conjunction with other procedures to determine first whether the pearl is natural or cultured (figure 20). Our primary concern in the following discussion, however, is their application in separating natural-color from treated blaclz pearls. ( source : Wholesale Pearl Necklaces )

U.V fluorescence can be diagnostic in this separation. For example, the fluorescence of natural-color blaclz pearls commonly varies from bright red (pearls from Baja California) to dull reddish brown (Tahiti pearls) when exposed to long-wave U.V radiation, while dyed pearls are usually inert or fluoresce a dull green (Benson, 1960; Crowningshield, 1970; Fryer et al., 1987; R. Crowningshield, pers. comm., 1989). ( source : Wholesale Pearl Necklaces )

wholesale pearls south sea pearls wholesale
If you looking for Wholesale Pearls & South Sea Pearls Wholesale, please contact us on phone or whatsapp +6287865026222 (Miss Joaquim Pearls Indonesia)

( source : Wholesale Pearl Necklaces )

X-ray fluorescence spectral analysis involves exposing the sample to X-rays and measuring the wavelengths emitted with a spectrometer (Komatsu and Alzamatsu, 1978). Silver used in the various silver salt treatments will be detected. This test must be performed carefully, by an experienced technician, since the sample pearls have been known to turn brown-black if exposed to the x-rays in a wave-length dispersive x-ray fluorescence unit. Therefore, most gem-testing laboratories use an energy-disersive XRF unit (as described in Liddicoat, 1987). ( source : Wholesale Pearl Necklaces )

X-radiography, a technique developed in the 1920s to separate natural from cultured pearls, has been discussed in detail in the standard gemology texts (see, e.g., Webster, 1983; Liddicoat, 1987). The method works on the principle that different materials such as nacre, conchiolin, and silver vary in their degree of transparency to X-radiation (Brown, 1979). Cultured pearls usually show high relief between the nucleus, with its dark ring of conchiolin, and the nacre. In a silver-treated pearl, the silver tends to concentrate in the area of the conchiolin. Because silver is opaque to X-rays, this area commonly appears white on the X-radiograph. ( source : Wholesale Pearl Necklaces )

The white ring or area around the nucleus of a treated blaclz pearl is sometimes called a reversal ring (Fryer et al., 1986, pp. 173 and 174). Also used in pearl identification is visual observation supplemented by microscopic observation. To the unaided eye, dyed materials will sometimes show an unusually even distribution of color throughout the pearl and in some cases throughout an entire strand of pearls. With magnification, dye can be seen concentrated around the drill hole and even extending out into the pearl in a vein-like fashion (as illustrated in Fryer et al., 1984, p. 230). ( source : Wholesale Pearl Necklaces )

In some instances, dye can be detected by using a cotton swab dipped in a weak (e.g., 2%) solution of nitric acid on an inconspicuous area of the pearl. This is, however, another destructive test (Fryer et al., 1984, p. 229). Visual examination is also useful in identifying irradiation in the smaller Alzoya pearls. Irradiation will darken freshwater pearls and shells, but not saltwater pearls. Therefore, since cultured pearls use freshwater-shell nuclei almost exclusively, the dark bead nucleus of an irradiated pearl is easily seen through the drill hole of the pearl. ( source : Wholesale Pearl Necklaces )

The color of the nacre is unchanged (Fryer et al., 1986, p. 173, and 1988, p. 244, figure 11). One must be careful, however, to make several tests on each pearl, since while irradiation changes the color of the bead, it does not change the reaction of the pearl to long-wave U.V. radiation (Matsuda and Miyoshi, 1988).  Even undrilled pearls can provide clues to the experienced pearl scientist by virtue of their visual appearance. The intense color and metallic luster
have been cited as indications of treatment (see, e.g., Fryer et al., 1985). ( source : Wholesale Pearl Necklaces )

It should be noted that size can be another important indicator of treatment. Small, rounded pearls 8 mm or less with very blaclz, gray, green, or blue-green hues are generally treated pearls – that is, smaller Alzoya pearls that have been dyed or irradiated-since the pearls grown in P. marguritifera are seldom smaller than 9 mm. Again, though, it is important to test pearls carefully, because some localities such as Baja California produce a lustrous blaclz pearl of natural color in small sizes. Black iilzeshi” pearls can also occur in small sizes. ( source : Wholesale Pearl Necklaces )

In recent years, Japanese scientists have led the way in pearl research. In 1978, Komatsu and Alzamatsu reported the success of their experiments with infrared film to separate natural-color from dyed blaclz pearls. Alzamatsu (pers. comm., 1989) reports that the Milzimoto Research Laboratory now finds spectrometry to be an even more efficient method to make the separation between natural-color and silver-treated blacks. Pearls from Pinctada margaritifera have a specific absorption at 700 nm that is caused by the blaclz pigment and can be easily measured by a spectrophotometer. ( source : Wholesale Pearl Necklaces )

The team of T Miyoshi, Y. Matsuda, and H. Komatsu has focused on methods for determining the parentage of cultured pearls using laser-induced fluorescence measured by a spectrofluorophotometer. In their 1987 paper, they
reported their observation of two fluorescence peaks-at 450 nm and 620 nm-in l? margarjtjfera. The 620 peak was not observed in P. maxima or P. fucata martensi, because the shells of these oysters do not contain porphyrins. This
makes it possible to separate l? margaritifera pearls from those produced by these two subgroups. Research such as this will provide the basis for more definitive pearl testing in the future. ( source : Wholesale Pearl Necklaces )

Articles source: POLYNESIAN BLACK PEARLS, By Marisa Goebel and Dona Mary Dirlam ( source : Wholesale Pearl Necklaces )
south sea pearls wholesaleFor Questions and answer you can contact & chat with us on:

  • Phone : +6287865026222
  • Facebook Massager click below :
  •  facebook.com/mutiaralomboktourpearlwholesale
  • Twitter : @abdurrachim
  • WhatsApp : +6287865026222
  • Email to: abdurrachim@gmail.com
  • Telegram id : mutiarapearl
  • LINE id : chatinmyline
  • wechat id: chatwechat

We send your parcel via FedEx

abdurrachim miss joaquim pearl send via fedex 1
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

abdurrachim pearl fedex
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

This is my name, my phone number and my address, as a sender (written by FedEx)
This is my name, my phone number and my address, as a sender (written by FedEx)

We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible
We send your purchasing parcel via FedEx, we inform you the tracking number as soon as possible

one sample of inside the box of parcels abdurrachim missjoaquim pearl
one sample of inside the box of parcels

Related Articles: