MajorsApr 01, 2026
Foundrae Sues Pandora for Allegedly Copying Its Medallion DesignsFoundrae also accused the jewelry giant of copying its mood board style of marketing.
GradingMay 22, 2019
GIA Spots Second Natural Diamond with Lab-Grown Layer
The stone is 0.64 carats and graded as a fancy grayish-greenish blue.
Gemological Institute of America researchers said the gray and blue components from the lab-grown layer of this diamond combined with the yellow from the natural substrate to create the color, fancy grayish-greenish blue. (Photo credit: Robison McMurtry)
Carlsbad, Calif.—GIA researchers recently spotted a second natural diamond with a lab-grown layer that added weight and improved the color, and warned that it could mean the trade will see more of these kind of composites.
According to an article by Troy Ardon and Garrett McElhenny in the spring 2019 edition of “Gems & Gemology,” the presence of both boron- and nitrogen-related defects—which are rarely seen together in natural diamonds—tipped them off there was something unusual about the stone.
The DiamondView fluorescence image of the diamond—a 0.64-carat fancy grayish-greenish blue cushion modified brilliant—showed a blue hue caused by the “cape” peak (nitrogen defect) and natural growth features.
The crown image, however, revealed a greenish-blue color common to boron-bearing diamonds and the dislocation patterns typically seen in diamonds grown using the chemical-vapor deposition (CVD) process.
In addition, a side view shows a distinct layer between the natural substrate and the CVD-grown portion of the stone. 
“These two distinct fluorescence patterns—the greenish-blue from the CVD layer and the darker blue from the naturally grown layer—prove that a layer of CVD synthetic diamond was grown on a natural substrate,” the article states.
A similar diamond, a 0.33-carat fancy blue that was also Type IIb with a CVD layer, was submitted to GIA in May 2017.
The CVD layer on this latest diamond is substantially thicker, 200 microns (approximately the thickness of two strands of human hairs) vs. 80 microns on the 0.33-carat diamond evaluated two years ago, and GIA noted that seeing a second example of this same type of composite could signal a new type of product entering the market.
The lab would not say if both diamonds came from the same client.
GIA also declined to comment on how the stones were submitted—as natural diamonds, or as natural/lab-grown composites—but did note that clients submitting goods are required to disclose all known treatments as well as whether a stone is natural or man-made.
To see more from the spring 2019 edition of “Gems & Gemology,” the Gemological Institute of America’s quarterly research journal, visit GIA.edu.
The Latest
AuctionsApr 01, 2026
John Jacob Astor IV’s Titanic Pocket Watch Heads to AuctionA Patek Philippe for Tiffany & Co. timepiece owned by the American businessman who died on the Titanic will be offered at Freeman's Chicago.
SurveysApr 01, 2026
Consumers’ Outlook Improves Again in MarchThe Conference Board’s Consumer Confidence Index edged up, with optimism about the present outweighing worries about the future.
Brought to you by
Protect Your Customers and Your BusinessYou deserve to know what you are selling–to protect your customers as well as your business and your reputation.
IndependentsApr 01, 2026
Zachary’s Jewelers’ Constance Polamalu to Release Children’s BookThe retailer’s Zach Bear gift comes to life in “Zach Bear and the Window Necklace,” which centers on curiosity, bravery, and helping.
Weekly QuizMar 26, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
Events & AwardsApr 01, 2026
AGA Opens 2026 Gemological Scholarship, Research Grant ApplicationsApplications are open for the AGA Gemological Scholarship Program through May 15, and until June 2027 for the Gemological Research Grant.
ColumnistsMar 31, 2026
Q1 Clues That Reveal Where Your Jewelry Store’s Sales Are Heading These customer behavior patterns say a lot about how successful your jewelry store is going to be this year, Emmanuel Raheb writes.
Brought to you by
Is This You? Every Jeweler Has This Problem; We Have the Solution.Every jeweler faces the same challenge: helping customers protect what they love. Here’s the solution designed for today’s jewelry business.
CollectionsMar 31, 2026
Mejuri Adds Silver to ‘Puzzle’ CollectionMejuri’s popular collection of 18-karat yellow gold vermeil rings debuted in sterling silver alongside new “Puzzle” slider charms.
CollectionsMar 31, 2026
Buddha Mama, Ashley Longshore to Host Pop-Up in DallasThe Miami-based jewelry brand and the NYC-based artist will be in Dallas from April 9-11.
SourcingMar 31, 2026
NDC Designates April 8 as 'World Diamond Day'The initiative invites those in the industry to share stories on social media highlighting the meaning and impact of natural diamonds.
SourcingMar 31, 2026
GIA VP Jillian Wolk to Take Over at Tracr Wolk’s first day on the job as CEO of Tracr, De Beers Group’s blockchain platform, will be May 1.
EditorsMar 30, 2026
Tom Moses Looks Back on His Decades at GIA Moses, who will leave the lab in May after nearly 50 years, discusses his start in the business, gemstones that stand out, and what’s next.
TrendsMar 30, 2026
Oscar Heyman Debuts First Spring CatalogThe new catalog, which showcases 35 one-of-a-kind pieces of jewelry, is a compliment to the company’s popular holiday catalog.
SourcingMar 30, 2026
Rio Tinto Hauls Last Load from DiavikProduction has ceased at the Canadian diamond mine, which has yielded more than 150 million carats of rough diamonds in its 23-year run.
MajorsMar 30, 2026
Tanishq Opens First New England LocationThe store opening marks the 10th United States location for the India-based jewelry retailer.
MajorsMar 27, 2026
Saks Global Has Changed Its Mind About Closing These 3 StoresTwo Saks Fifth Avenue locations, one in Florida and one in California, and one Neiman Marcus store are off the chopping block.
IndependentsMar 27, 2026
Jimmy West, Longtime LJG Executive Director, Dies at 72West, who started in the art department at the Leading Jewelers Guild in 1979, is remembered for his patience, kindness, and dedication.
CollectionsMar 27, 2026
Itä’s ‘Yarí Whirl’ Ring Tells Every Side of the StoryIn the “Tesoro” version of the ring, our Piece of the Week, each side of the gold hexagonal nugget has a unique colored gemstone design.
WatchesMar 26, 2026
Q&A: Citizen Watch America President Jeffrey Cohen on Eco-Drive’s 50th AnniversaryCohen discusses the evolution of Citizen’s light-powered technology, the brand’s cross-generational appeal, and tariffs.
IndependentsMar 26, 2026
Peter Smith Pens Book on Human Behavior in Sales“Essentially Human: On Sales and Salespeople" reveals the underlying human traits and behaviors of the most successful sales professionals.
CollectionsMar 26, 2026
Lionheart Celebrates 13 Years of ‘Cassandane’The collection features symbols of love, luck, and light, based on the story of Queen Cassandane and Cyrus the Great of Persia.
Events & AwardsMar 26, 2026
NAJA, Instappraise Introduce New ScholarshipIt’s the third scholarship to be launched as part of the partnership to help appraisers advance their professional credentials.
Events & AwardsMar 26, 2026
JA Still Accepting Entries for 2026 CASE AwardsThe deadline for entries in the jewelry design competition has been extended to April 3.
SourcingMar 25, 2026
Rob Bates Steps Down as JCK News Director After 28 years with JCK, the veteran industry journalist is launching his own publication on Substack called The Jewelry Wire.
CollectionsMar 25, 2026
Boochier Turns Flower Friendship Bracelets Into Fine JewelryThe “Flower Puff” collection looks to beaded flower friendship bracelets from childhood, turning the silhouette into nostalgic fine jewelry.
Policies & IssuesMar 25, 2026
Community for Ethical Jewelry to Host Bench Jeweler Shortage WebinarSet for April 2, the webinar will discuss how the jewelry industry can address the workforce gap.
