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
IndependentsSep 29, 2026
Christy Bromberg, Longtime Gift Buyer for Underwood Jewelers, Dies at 68She is remembered for her joie de vivre, upbeat personality, genuine interest in other people, and love of the Alabama Crimson Tide.
AuctionsSep 29, 2026
Dionne Warwick’s Jewelry Goes Up for AuctionOnline bidding is open now for Julien’s sale of items owned by the “Walk On By” singer, whose final album comes out this fall.
Events & AwardsSep 29, 2026
Matt Stuller to Receive 2027 Gem Award for Lifetime AchievementThe founder and executive chairman of Stuller Inc. is being honored for his impact on the jewelry industry at the 25th annual Gem Awards.
Brought to you by
Meet Gemology’s Next Generation Microscope: GIA® Gemolite® NXT Professional EditionExperience gemstones with greater precision and comfort than ever before.
ColumnistsSep 29, 2026
Your Holiday Marketing Has a Bridal Blind SpotDecember is the most popular month to propose, and jewelers need to keep that in mind when planning their holiday marketing.
Weekly QuizSep 25, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
AuctionsSep 29, 2026
If You Love Cats, This Jewelry Auction Is for YouCat ladies of the jewelry world, unite. Sandy Lerner’s collection of cat jewelry and other objects is going up for auction Wednesday.
CollectionsSep 28, 2026
De Beers London Drops Water-Inspired High Jewelry Collection“Vibrations” features several firsts for De Beers’ high jewelry, including the use of chalcedony and diamonds sourced from artisanal miners.
Brought to you by
Your Piece Could Be the One Editors Talk AboutSubmit your pieces for a chance to win in this year's competition.
CollectionsSep 28, 2026
Jessica McCormack Turns to Classic Motif for New CollectionThe “Bows” collection features three interpretations of the bow motif designed with Georgian and Victorian influences.
Events & AwardsSep 28, 2026
Guy Borenstein, Troy Underwood Among the Professionals Honored at AGS Conclave 2026The American Gem Society recognized industry members, one Guild, and a law enforcement official for their contributions to jewelry.
FinancialsSep 28, 2026
Instappraise, Jewelers Mutual Look to Simplify Jewelry InsuranceThrough a new system integration, customers can now receive instant personal jewelry insurance quotes at the time of appraisal.
WatchesSep 25, 2026
Smaller Rolex Watches Showing Strength on Secondary Market, Data ShowsFive of the 10 fastest-appreciating Rolex models on Bob’s Watches were Datejust 31 or Lady Datejust watches.
MajorsSep 25, 2026
Sherwood Family Buys Back Daniel’s Jewelers from Private EquityThe Sherwood family and AJS Creations CEO Tejas Shah purchased the jewelry chain back from Palladium Equity Partners.
TrendsSep 25, 2026
A Peek at Taylor Swift’s Game-Day DiamondsThe artist wore Dana Rebecca Designs’ marquise diamond-set gold hoops at the Chiefs game last Sunday. Now they’re our Piece of the Week.
CrimeSep 24, 2026
From Conclave: Security Measures Jewelers Should Be TakingJSA and Jewelers Mutual shared advice on spotting suspicious behavior, combatting cell phone jammers, and staying safe at home.
AuctionsSep 24, 2026
8-Carat Blue Diamond Heads to UK Jewelry AuctionThe fancy light blue diamond is estimated to fetch up to $2.6 million at Elmwood’s next week.
TrendsSep 24, 2026
This New Jewelry Book Decodes the Secret Meaning in Victorian Jewelry“Secret Language of Victorian Jewelry” unveils the meaning behind the symbols, motifs, and gemstones used in Victorian-era jewelry.
TrendsSep 23, 2026
Holiday Diamond Jewelry Trends: Layered Looks, PersonalizationThis holiday season, look to pieces that will help to fill out customers’ everyday diamond jewelry wardrobe, experts say.
SourcingSep 23, 2026
Organization That Promotes Natural Diamond Rebrands for Third Time The Natural Diamond Council is now The Diamond Collective and has announced a new strategy under CEO Amber Pepper.
IndependentsSep 23, 2026
This Milwaukee-Area Jeweler Is Serving the 7CsPaul’s Jewelers sells coffee, chocolate, and cookies from a custom gold-wrapped trailer parked outside the store starting at 7 a.m.
MajorsSep 23, 2026
Kay Jewelers’ New Campaign Goes ‘All In’ on LovePart of its brand relaunch, the marketing around the campaign includes a contest involving a jacket set with 550 diamonds.
Events & AwardsSep 23, 2026
Tiffany & Co. Exhibition Opening at Arkansas Museum The curation, opening soon at the Crystal Bridges Museum of American Art, honors the jeweler’s heritage through a distinctly American lens.
CollectionsSep 23, 2026
Pucker Up for Pandora’s New Pat McGrath Jewelry CollabThe jewelry giant has partnered with the famed makeup artist to create a colorful new collection of charms and rings.
IndependentsSep 23, 2026
Texas Jewelers Association to Celebrate 120th AnniversaryThe association will mark the milestone at its convention next month.
IndependentsSep 23, 2026
Sissy’s Log Cabin’s ‘Back to School and Bling’ Event ReturnsThe jeweler donated school supplies to Memphis, Tennessee, students during the event combining basketball and mentorship.
MajorsSep 22, 2026
Foundrae’s Lawsuit Against Pandora Can Continue, Court RulesA federal judge denied Pandora’s motion to dismiss Foundrae’s claim for copyright infringement of its medallions.
