FinancialsMay 17, 2024
Richemont Appoints Van Cleef & Arpels’ Nicolas Bos as New CEOThe announcement coincided with its full-year results, with growth driven by its jewelry brands.
GradingAug 15, 2018
Glued-Together Diamond Turns Up at GIA
The stone had been broken in half and put back together with an “unknown adhesive,” and couldn’t be graded by the Carlsbad lab.
A face-up photo of the glued-together diamond recently spotted by graders in the GIA lab in Carlsbad (Photo by Robison McMurtry/GIA)
Carlsbad, Calif.—The Gemological Institute of America said its Carlsbad lab recently received a diamond that had broken in half and been repaired with an adhesive of some sort.
In the summer 2018 issue of Gems & Gemology, GIA research associate Troy Ardon wrote a lab note about a 1.38-carat marquise-cut diamond submitted to the laboratory for colored diamond grading services.
Graders initially noted large fractures and a large cavity on the table. After careful examination under a microscope, they discovered that the stone had been broken in half and then repaired with an “unknown adhesive,” a method the lab noted was unusual.
The GIA said there were a number of factors that hinted to it being broken and put back together imperfectly, the first being a large fracture from crown to pavilion showing a “sizeable gap” throughout the diamond.
The fracture indicated it was a repair, rather than two separate diamonds glued together to make a larger stone, because it had an irregular surface, according to Gems & Gemology.
From a certain angle, graders could also see large air bubbles trapped in the fracture.
Additionally, the facets that the fracture transected showed “slight to moderate” misalignment, which the GIA confirmed can’t happen during the polishing process.
The GIA said polish lines on the pavilion facets contained a pattern that would’ve lined up if it wasn’t for the fracture that separated them, demonstrating that the breakage occurred after the diamond had been at least somewhat polished. Beyond that, it’s not possible to tell when the damage happened, the lab said.
While the application of glue to diamonds to form a diamond-diamond doublet has been done before, the GIA noted that it has never seen a broken diamond repaired with adhesive in this manner.
The lab was not able to grade the diamond because the 4Cs don’t apply to “composites” like this. For example, the carat weight would actually represent the sum of the two diamond weights plus that of the adhesive.
More on Grading
The Latest
FinancialsMay 17, 2024
Watches of Switzerland’s Fiscal-Year Sales Flat Looking ahead, the retailer said it sees “enormous potential” in Roberto Coin’s ability to boost its branded jewelry business.
Recorded WebinarsMay 17, 2024
Watch: Preparing for Trade Show SuccessJewelry trade show veterans share strategies for engaging buyers, managing your time effectively, and packing the right shoes.
Brought to you by
Record Gold Prices Have Consumers Undeterred. Here’s Why.Despite the rising prices, consumers continue to seek out the precious metal.
AuctionsMay 17, 2024
Piece of the Week: Cartier’s Ring-Tailed LemurThis little guy’s name is Ricky and he just sold for more than $200,000 at Sotheby’s Geneva jewelry auction.
Weekly QuizMay 16, 2024
This Week’s QuizTest your jewelry news knowledge by answering these seven questions.
AuctionsMay 16, 2024
Christie’s Holds 2 Sales Despite CyberattackThough its website has been down for a week, Christie’s proceeded with its jewelry and watch auctions on May 13-14, bringing in nearly $80 million.
AuctionsMay 16, 2024
Sotheby’s Withdraws 101-Carat Yellow Diamond from AuctionDespite the absence of “The Allnatt,” Sotheby’s Geneva jewelry auction totaled $34 million, with 90 percent of lots sold.
Brought to you by
From Registration to Return: 10 Tips to Protect You Before, During and After a TradeshowTradeshow risks are real. Get tips to protect yourself before, during and after and gain safety and security awareness for your business.
ColumnistsMay 16, 2024
The PR Adviser: What the Designer Should’ve DoneLilian Raji gives advice to designers on how to make the most of great publicity opportunities.
SourcingMay 16, 2024
Lucapa to Shed Stake in Lesotho Diamond Mine The mining company wants to divest its 70 percent holding in the Mothae Diamond Mine in an effort to streamline its portfolio.
ColumnistsMay 15, 2024
Squirrel Spotting: Why Retailers Struggle to Fire BrandsWhy do so many jewelers keep lines that are not selling? Peter Smith thinks the answer lies in these two behavioral principles.
AuctionsMay 15, 2024
Red Diamond Breaks Records at Phillips GenevaThe “Argyle Phoenix” sold for more than $4 million at the auction house’s second jewels sale.
Events & AwardsMay 15, 2024
See Who’s in JA’s 2024 ‘20 Under 40’ ClassThe annual list recognizes young professionals making an impact in jewelry retail.
IndependentsMay 15, 2024
David Mann Jewelers in Upstate NY to Close After 35 YearsOwner David Mann is heading into retirement.
FinancialsMay 15, 2024
Brilliant Earth’s Sales Fall Flat in Q1 While overall sales were sluggish, the retailer said its non-bridal fine jewelry was a popular choice for Valentine’s Day.
SourcingMay 14, 2024
Anglo American Confirms It Is Looking to Sell De Beers The mining giant also wants to offload its platinum business as part of an overhaul designed to “unlock significant value.”
AuctionsMay 14, 2024
2 Huge Yellow Diamonds Are Heading to AuctionChristie's is selling one of the diamonds, moving forward with its Geneva jewelry auction despite the cyberattack that took down its website.
MajorsMay 14, 2024
Platinum Born Taps ‘Born Leaders’ for New CampaignThe ad aims to position platinum jewelry as ideal for everyday wear.
Lab-GrownMay 13, 2024
Lab-Grown Diamond Brand Lightbox Cuts Prices by 25 to 40%The move follows a price-drop test run in Q4 and comes with the addition of a “quality assurance card” from GIA for some loose diamonds.
TechnologyMay 13, 2024
Christie’s Website Brought Down by Hackers, Watch Auction Postponed The site has been down since Thursday evening, just ahead of its spring auctions.
AuctionsMay 13, 2024
Madeleine Albright’s Jewelry, Pins a White-Glove Sale at Freeman’s | HindmanThe late former U.S. Secretary’s collection went for quadruple the sale’s pre-sale estimate.
IndependentsMay 13, 2024
Zachary’s Jewelers Names Mother’s Day Jewelry Contest WinnersThree fifth graders’ winning designs were turned into custom jewelry pieces in time for Mother’s Day.
IndependentsMay 10, 2024
Frank Adams Jewelers Names New CEOKimberly Adams Russell is taking over the role from her father, David Adams, marking the third generation to hold the title.
CollectionsMay 10, 2024
Piece of the Week: Carina Hardy’s ‘Birth of Venus’ NecklaceAs a token of womanhood, this necklace depicts when Venus was born from the sea.
MajorsMay 09, 2024
Watches of Switzerland Pays $130M for Roberto Coin Inc.The deal gives the retailer control over the distribution of Roberto Coin jewelry in the U.S., Canada, Caribbean, and Central America.
TrendsMay 09, 2024
Amanda’s Style File: Shine Bright, Moms Show your mother some love with a piece of fine jewelry.
IndependentsMay 09, 2024
Kyle Edward Fine Jewelry to Close Salisbury StoreThe company’s Easton location will remain open.
