Lab-GrownApr 18, 2023
Tom Chatham Has Written a Book About His FamilyLab-GrownMay 08, 2023
This Is the Biggest Faceted Lab-Grown Diamond GIA’s Ever Seen
India’s Ethereal Green Diamond grew the 34.59-carat stone, which GIA said represents a milestone in CVD growth.
A company in India grew this 34.59-carat, G color, VS2 clarity diamond using the chemical-vapor deposition process. GIA said it’s the largest polished lab-grown diamond ever submitted to one of its labs. (Photo credit: Johnny (Chak Wan) Leung)
Hong Kong—The Gemological Institute of America recently examined a record-setting lab-grown diamond created using the chemical-vapor deposition (CVD) process.
Grown by Mumbai, India-based Ethereal Green Diamond LLP and submitted to GIA’s lab in Hong Kong, the diamond weighs 34.59 carats and measures 24.94 × 13.95 × 9.39 mm.
“This 34.59-carat CVD laboratory-grown diamond is the largest faceted laboratory-grown diamond GIA has ever seen, CVD or HPHT,” GIA Vice President of Research and Development Wuyi Wang said.
Two employees at GIA Hong Kong, senior staff gemologist Ka Wing Tam and manager of diamond identification Terry “Ping Yu” Poon, detailed the examination of the stone in a research note GIA published online last week. The note also will appear in the summer 2023 print edition of Gems & Gemology.
The emerald-cut diamond was graded G color and VS2 clarity, with small black graphite inclusions inside the body of the diamond and others forming clusters between the diamond’s growth layers.
Fluorescence imaging conducted using the DiamondView, one of the instruments De Beers Group developed for diamond detection, revealed the growth striations typically seen in CVD diamonds, the research notes states.
In addition, microscopic observation showed a “weak oily or wavy” graining in the table facet, a feature sometimes seen in gem-quality CVD diamonds.
Related stories will be right here …
Grown by Mumbai, India-based Ethereal Green Diamond LLP and submitted to GIA’s lab in Hong Kong, the diamond weighs 34.59 carats and measures 24.94 × 13.95 × 9.39 mm.
“This 34.59-carat CVD laboratory-grown diamond is the largest faceted laboratory-grown diamond GIA has ever seen, CVD or HPHT,” GIA Vice President of Research and Development Wuyi Wang said.
Two employees at GIA Hong Kong, senior staff gemologist Ka Wing Tam and manager of diamond identification Terry “Ping Yu” Poon, detailed the examination of the stone in a research note GIA published online last week. The note also will appear in the summer 2023 print edition of Gems & Gemology.
The emerald-cut diamond was graded G color and VS2 clarity, with small black graphite inclusions inside the body of the diamond and others forming clusters between the diamond’s growth layers.
Fluorescence imaging conducted using the DiamondView, one of the instruments De Beers Group developed for diamond detection, revealed the growth striations typically seen in CVD diamonds, the research notes states.
In addition, microscopic observation showed a “weak oily or wavy” graining in the table facet, a feature sometimes seen in gem-quality CVD diamonds.
The nearly 35-carat diamond is more than twice the size of the 16.41-carat princess-cut lab-grown diamond created by Shanghai Zhengshi Technology Co. Ltd. and examined at GIA’s Carlsbad lab in early 2022.
At the time, that diamond was said to be largest known CVD-grown diamond in the world, though another Indian company exhibited two larger lab-grown diamonds at the JCK show in June last year.
GreenLab Diamonds LLP brought three large lab-grown diamonds to Las Vegas, a trio that included the 20.24-carat emerald-cut “Shivaya” and a 27.27-carat marquise step-cut called the “Om.” The International Gemological Institute graded the stones.
GIA called the creation of this 34.59-carat diamond a “milestone” in CVD growth while noting, “Mined diamonds with similar size and quality are very rare.”
It did, however, highlight one key difference between the 16-carat diamond it examined last year and the much larger lab-grown diamond that just came into its Hong Kong facility.
The 16-carat, princess-cut lab-grown diamond is G color, VVS2 clarity and was not treated to improve its color—which is unusual for CVD diamonds—while GIA researchers confirmed the 34-carat diamond underwent post-growth HPHT annealing to bump it up to a G.
Editors' Picks
Sponsored by
More on Lab-Grown
The Latest
CrimeFeb 13, 2026
JSA Offering $10K Reward in Nancy Guthrie Case Guthrie, the mother of “Today” show host Savannah Guthrie, was abducted just as the Tucson gem shows were starting.
IndependentsFeb 13, 2026
97-Year-Old New Mexico Jewelry Store To CloseButterfield Jewelers in Albuquerque, New Mexico, is preparing to close as members of the Butterfield family head into retirement.
CollectionsFeb 13, 2026
A ‘Rosebud’ Necklace for Valentine’s DayPaul Morelli’s “Rosebud” necklace, our Piece of the Week, uses 18-karat rose, green, and white gold to turn the symbol of love into jewelry.
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 13, 2026
JFC Announces New BeneficiariesThe nonprofit has welcomed four new grantees for 2026.
Weekly QuizFeb 12, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
MajorsFeb 12, 2026
These 8 Saks Fifth Avenue Stores Are ClosingParent company Saks Global is also closing nearly all Saks Off 5th locations, a Neiman Marcus store, and 14 personal styling suites.
CollectionsFeb 12, 2026
British Museum Raises $5M to Keep Jewel Linked to Henry VIII, Katherine of AragonIt is believed the 24-karat heart-shaped enameled pendant was made for an event marking the betrothal of Princess Mary in 1518.
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.
SourcingFeb 12, 2026
‘Cotton Candy’ Necklace, 35-Carat Kunzite Win 2025 ‘Buyer’s Choice’ AwardsThe AGTA Spectrum and Cutting Edge “Buyer’s Choice” award winners were announced at the Spectrum Awards Gala last week.
Events & AwardsFeb 12, 2026
Kering Opens Entries for 2026 Sustainability-Focused AwardThe “Kering Generation Award x Jewelry” returns for its second year with “Second Chance, First Choice” as its theme.
TrendsFeb 11, 2026
Halle Berry’s Retro Engagement Ring Is a Sapphire-Set StunnerSourced by For Future Reference Vintage, the yellow gold ring has a round center stone surrounded by step-cut sapphires.
MajorsFeb 11, 2026
Francesca’s Files for Chapter 11 Bankruptcy AgainThe clothing and accessories chain announced last month it would be closing all of its stores.
CollectionsFeb 11, 2026
Zales Turns Sweethearts Into Jewelry for Valentine’s Day CollectionThe “Zales x Sweethearts” collection features three mystery heart charms engraved with classic sayings seen on the Valentine’s Day candies.
TechnologyFeb 11, 2026
Gemvision Symposium 2026 Slated for AprilThe event will include panel discussions, hands-on demonstrations of new digital manufacturing tools, and a jewelry design contest.
Events & AwardsFeb 11, 2026
TJS Announces Roundtable, Launches New AppRegistration is now open for The Jewelry Symposium, set to take place in Detroit from May 16-19.
SourcingFeb 10, 2026
At Meeting in South Africa, Support for Natural Diamonds Picks Up Steam Namibia has formally signed the Luanda Accord, while two key industry organizations pledged to join the Natural Diamond Council.
TrendsFeb 10, 2026
Bad Bunny Wears Football-Shaped ‘Desert Diamond’ for Halftime PerformanceLady Gaga, Cardi B, and Karol G also went with diamond jewelry for Bad Bunny’s Super Bowl halftime show honoring Puerto Rico.
SurveysFeb 10, 2026
Shoppers to Spend Big on Jewelry This Valentine’s Day, Says NRFJewelry is expected to be the No. 1 gift this year in terms of dollars spent.
FinancialsFeb 10, 2026
Kering Plans Transformation as 2025 Sales Sink 13%As star brand Gucci continues to struggle, the luxury titan plans to announce a new roadmap to return to growth.
SourcingFeb 10, 2026
AGTA To Debut ‘Stuller Color of the Year’ Spectrum Awards CategoryThe new category asks entrants for “exceptional” interpretations of the supplier’s 2026 color of the year, which is “Signature Red.”
Policies & IssuesFeb 09, 2026
U.S., India Trade Deal One Step Closer to Being FinalizedThe White House issued an official statement on the deal, which will eliminate tariffs on loose natural diamonds and gemstones from India.
Events & AwardsFeb 09, 2026
JA Now Accepting Entries for 2026 CASE AwardsEntries for the jewelry design competition will be accepted through March 20.
IndependentsFeb 09, 2026
James Free Jewelers Unveils Revamped FlagshipThe Ohio jeweler’s new layout features a curated collection of brand boutiques to promote storytelling and host in-store events.
TrendsFeb 09, 2026
These 14 Jewels Will Melt Your Heart This Valentine’s DayFrom heart motifs to pink pearls, Valentine’s Day is filled with jewelry imbued with love.
CrimeFeb 06, 2026
Florida Man Sentenced After Selling Fake Native American Jewelry for a Decade Prosecutors say the man attended arts and craft fairs claiming he was a third-generation jeweler who was a member of the Pueblo tribe.
FinancialsFeb 06, 2026
Pandora’s North America GM Departs Amid Executive ChangesNew CEO Berta de Pablos-Barbier shared her priorities for the Danish jewelry company this year as part of its fourth-quarter results.
TrendsFeb 06, 2026
Margot Robbie, Jacob Elordi Wear Matching Cece Jewellery Signet RingsOur Piece of the Week picks are these bespoke rings the “Wuthering Heights” stars have been spotted wearing during the film’s press tour.
