CollectionsApr 08, 2026
Hearts On Fire Celebrates 30 Years By Asking a QuestionThe “What’s Your Signature?” campaign invites women to think about how they see themselves.
GradingMay 03, 2017
GIA Sees Blue Diamond That’s Synthetic-Natural Composite
The 0.33-carat stone has a very thin layer of CVD-grown Type IIb diamond on top that earned it a grade of fancy blue.
This is the 0.33-carat fancy blue diamond that the Gemological Institution of America determined was a synthetic-natural composite. When asked about the color of the diamond--which does not appear to be all that blue--the GIA said pale colors are difficult to photograph. (Photo by Sood Oil (Judy) Chia.)
New York--The Gemological Institute of America reports that a mined white diamond with an extremely thin layer of blue lab-grown diamond on top was submitted to its New York laboratory recently.
According to an article published online now and slated for the summer print edition of “Gems & Gemology,” the 0.33-carat stone is a composite of CVD synthetic Type IIb diamond overgrowth on a natural Type Ia.
The lab-grown diamond layer is only 80 microns (0.003 inches) thick, but it’s enough for the diamond to grade as a fancy blue.
Though the GIA said the stone was not submitted as a lab-grown diamond, there were a few things that tipped off researchers.
As the article states, the diamond had both nitrogen and boron defects. Nitrogen defects are the most common defect found in natural diamonds, while boron is the element that gives diamonds a blue tint and is a rare impurity, which is why natural blue diamonds are so few and so valuable.
The GIA said it is “very unusual” to see these two elements together in a single diamond, as essentially what they were looking at was a mixed Type Ia and Type IIb diamond. The last time the GIA reported on one of these being found in nature was nearly 10 years ago, in the spring 2009 edition of “Gems & Gemology.”
Secondly, a detailed analysis conducted using the DiamondView machine showed a yellowish-green fluorescence zone at the top of the crown that had a clearly defined boundary visible along the interface layer on the crown facets.
This, combined with SiV- defects and phosphorescence, indicated to GIA researchers that the top layer was a diamond grown using the chemical vapor deposition (CVD) process.
The bottom of the stone, meanwhile, displayed blue fluorescence but no phosphorescence in the DiamondView and had a strain pattern in the pavilion, both of which are consistent with a stone that is a natural Type Ia diamond.
This is the not the first diamond that’s a synthetic-natural combination.
The GIA noted in its research article that CVD diamond films have been applied to natural diamonds since the 1960s, and the successful addition of CVD-grown diamond layers on top of mined diamonds happened in 1993.
But this is the first synthetic overgrowth on a natural diamond with a fancy color grade that the GIA said it has ever seen.
As the lab put it
in an email to National Jeweler on Tuesday: “Although CVD has been experimentally used to grow over natural diamond, it is not a simple process to perform with a favorable result on a gem-quality diamond.”
That is, apparently, until now.
GIA Director of Research and Development Wuyi Wang, along with New York-based GIA researchers Kyaw Soe Moe, Paul Johnson and Ulrika D’Haenens-Johansson, authored the article.
That is, apparently, until now.
GIA Director of Research and Development Wuyi Wang, along with New York-based GIA researchers Kyaw Soe Moe, Paul Johnson and Ulrika D’Haenens-Johansson, authored the article.
More on Grading
The Latest
SourcingApr 08, 2026
Sale of 42-Carat Blue Diamond Gives Petra a Boost in Q3The big diamond’s sale added to the company’s revenue though the market remains “challenging” overall, particularly for smaller goods.
Events & AwardsApr 08, 2026
AGS Confluence Returns with AI, Sustainability SessionsRob Bates of The Jewelry Wire will also moderate a panel on the state of the jewelry industry during the virtual event.
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.
Events & AwardsApr 08, 2026
TJS to Honor 2 Longtime Former Stuller EmployeesThe Jewelry Symposium will honor two industry veterans with lifetime achievement awards at its upcoming May event.
Weekly QuizApr 02, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
TrendsApr 08, 2026
Amanda’s Style File: April’s Brilliant Birthstone With their durability, brilliance, and beauty, diamonds are the perfect stone for everyday birthstone jewelry.
MajorsApr 07, 2026
QVC Group’s Latest Filing Calls Its Future Into QuestionThe retailer failed to file its annual report on time and said it may issue a going concern warning.
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.
ColumnistsApr 07, 2026
Peter Smith: A Tip to the Post Office on Workplace CultureSmith recounts a recent trip to the post office that included an uncomfortable, embarrassing, and public exchange between two employees.
CollectionsApr 07, 2026
Nerd Out Over Gemology Geek’s First Jewelry CollectionFounder Erica Silverglide has designed 35 colorful pieces set with fluorescing gemstones for the brand's first finished jewelry offering.
CollectionsApr 07, 2026
Ukrainian Jewelers Highlighted In New Book“Ukrainian Jewelry | Contemporary Jewelry and Art Jewelry from Ukraine” features 33 contemporary Ukrainian designers and studios.
CollectionsApr 06, 2026
Fope’s New Jewelry Debuts Are Golden“The Golden Now” campaign celebrates the here and now with the brand’s signature styles and a selection of its new pieces.
MajorsApr 06, 2026
Kecia Caffie, Corinne Bentzen No Longer With Signet JewelersSignet confirmed that Caffie, president of Zales and Banter, and Bentzen, who headed Blue Nile, have left the company.
CollectionsApr 06, 2026
Historian Tanzy Ward Pens Book on Black Victorians’ JewelryThe antique jewelry dealer talks about the importance of including Black Americans in jewelry history and preserving their stories.
SourcingApr 06, 2026
Gemfields Reports $51M Loss in 2025Both its mines faced challenges last year, from operational issues to disruptions in the market.
CollectionsApr 03, 2026
Taylor Swift’s ‘Elizabeth Taylor’ Video Puts Jewelry Front and CenterIconic pieces, like the Mike Todd Diamond Tiara, appear in the superstar’s new music video for her song inspired by the actress.
MajorsApr 03, 2026
Saks Global Says It Will Emerge From Bankruptcy This SummerThe luxury retailer, which went Chapter 11 in January, announced Thursday that it has secured $500 million in exit financing.
Events & AwardsApr 03, 2026
JCK Luxury, NouvelleBox Partner on New Designer BallroomThe NouvelleBox ballroom will feature independent jewelry designers, including Lene Vibe, Wyld Box Jewelry, and Kiaia Limited.
CollectionsApr 03, 2026
Buddha Mama Brings Its ‘Moon’ Locket To DallasThe one-of-a-kind locket, our Piece of the Week, opens to reveal three hidden images to keep close to your heart.
MajorsApr 02, 2026
Pandora Opens New Canadian Distribution Center Amid Tariff ConcernsThe new facility was also designed to better serve its growing customer base in Canada.
TrendsApr 02, 2026
Michelle Yeoh Fronts New Mikimoto Campaign The campaign is a tribute to the year 1893, when Kokichi Mikimoto created the world’s first cultured pearl.
MajorsApr 02, 2026
DCA Launches ‘Second Spark’ Workforce InitiativeThe initiative connects veterans and parents returning to the workforce with careers in jewelry retail.
MajorsApr 02, 2026
Hoover & Strong Names New National Sales RepresentativeThe wholesale manufacturer and precious metals refiner has appointed Michael Angelo as its new national sales representative.
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.
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.
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.
