ColumnistsFeb 04, 2026
January Jewelry Sales: More Dollars Spent, Fewer Units Sold Sherry Smith unpacks independent retailers’ January performance and gives tips for navigating the slow-growth year ahead.
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
MajorsFeb 04, 2026
What Designers Should Know About Saks Global’s BankruptcyFrom how to get an invoice paid to getting merchandise returned, JVC’s Sara Yood answers some complex questions.
TrendsFeb 04, 2026
Amanda’s Style File: February Birthstone BlissAmethyst, the birthstone for February, is a gemstone to watch this year with its rich purple hue and affordable price point.
Brought to you by
The MJSA Mentor & Apprenticeship Program: Attracting & Training the Next Generation of Bench JewelersLaunched in 2023, the program will help the passing of knowledge between generations and alleviate the shortage of bench jewelers.
MajorsFeb 04, 2026
Marco Bicego Names New Global Marketing DirectorThe Italian jewelry company appointed Matteo Cuelli to the newly created role.
Weekly QuizJan 29, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
MajorsFeb 04, 2026
Frederick Goldman Updates Leadership TeamThe manufacturer said the changes are designed to improve speed, reliability, innovation, and service.
Policies & IssuesFeb 03, 2026
Tariff Relief on Horizon for India as Trump, Modi Make DealPresident Trump said he has reached a trade deal with India, which, when made official, will bring relief to the country’s diamond industry.
Brought to you by
How Jewelers Can Fight Back Against Cell JammersCriminals are using cell jammers to disable alarms, but new technology like JamAlert™ can stop them.
CollectionsFeb 03, 2026
Jade Trau Releases New Charms, Introduces RondellesThe designer’s latest collection takes inspiration from her classic designs, reimagining the motifs in new forms.
WatchesFeb 03, 2026
Casio America Calls Jersey City HomeThe watchmaker moved its U.S. headquarters to a space it said fosters creativity and forward-thinking solutions in Jersey City, New Jersey.
SourcingFeb 03, 2026
Nivoda Reveals Upgraded Gemstone MarketplaceThe company also announced a new partnership with GemGuide and the pending launch of an education-focused membership program.
CrimeFeb 02, 2026
Ylang 23’s Dallas Store BurglarizedThe Texas jeweler said its team is “incredibly resilient” and thanked its community for showing support.
EditorsFeb 02, 2026
Stars Choose Chokers, Elongated Earrings at 2026 GrammysFrom cool-toned metal to ring stacks, Associate Editor Natalie Francisco highlights the jewelry trends she spotted at the Grammy Awards.
CollectionsFeb 02, 2026
2026 Winter Olympic Medal Design Symbolizes UnityThe medals feature a split-texture design highlighting the fact that the 2026 Olympics are taking place in two different cities.
SurveysJan 30, 2026
These Are the Top Brands of 2026, Says YouGovFrom tech platforms to candy companies, here’s how some of the highest-ranking brands earned their spot on the list.
CollectionsJan 30, 2026
Follow the Beat With Etiq’s ‘Khol’ RingThe “Khol” ring, our Piece of the Week, transforms the traditional Indian Khol drum into playful jewelry through hand-carved lapis.
MajorsJan 30, 2026
Arch Crown’s 2026 ‘Tag & Label’ Catalog Is HereThe catalog includes more than 100 styles of stock, pre-printed, and custom tags and labels, as well as bar code technology products.
CollectionsJan 29, 2026
Ghirardelli’s ‘Chocolocket’ Returns for Valentine’s DayThe chocolatier is bringing back its chocolate-inspired locket, offering sets of two to celebrate “perfect pairs.”
AuctionsJan 29, 2026
These Were Bonhams’ Top 10 Jewelry Lots in 2025The top lot of the year was a 1930s Cartier tiara owned by Nancy, Viscountess Astor, which sold for $1.2 million in London last summer.
SourcingJan 29, 2026
Stuller Website to Mark AGTA-Sourced GemstonesAny gemstones on Stuller.com that were sourced by an AGTA vendor member will now bear the association’s logo.
WatchesJan 29, 2026
Audemars Piguet Opens AP House in AtlantaThe Swiss watchmaker has brought its latest immersive boutique to Atlanta, a city it described as “an epicenter of music and storytelling.”
SourcingJan 28, 2026
Ethical Gem Fair to Debut Designer Showcase in TucsonThe new addition will feature finished jewelry created using “consciously sourced” gemstones.
ColumnistsJan 28, 2026
Peter Smith: Setting the Next Generation Up for SuccessIn his new column, Smith advises playing to your successor's strengths and resisting the urge to become a backseat driver.
SurveysJan 28, 2026
Consumer Confidence Falls Below Pandemic Lows in JanuaryThe index fell to its lowest level since May 2014 amid concerns about the present and the future.
IndependentsJan 28, 2026
Foundrae Heads to Aspen for Latest Store OpeningThe new store in Aspen, Colorado, takes inspiration from a stately library for its intimate yet elevated interior design.
FinancialsJan 28, 2026
Tiffany & Co., Bulgari Sales Resilient as LVMH’s 2025 Sales SlipThe brands’ high jewelry collections performed especially well last year despite a challenging environment.
CollectionsJan 27, 2026
De Beers London, GemFair Debut New Collection Highlighting Artisanal DiamondsThe collection marks the first time GemFair’s artisanal diamonds will be brought directly to consumers.
