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.
More on Lab-Grown
The Latest
TrendsOct 03, 2025
Selena Gomez, Benny Blanco Tie the Knot Wearing Diamonds, White MetalsGomez’s jewelry included Tiffany & Co. drop-style earrings while Blanco stacked diamonds from Jacob & Co. on his wrist.
GradingOct 03, 2025
Grading Lab HRD Antwerp Names New CEODiamond industry banking veteran Paul De Wachter will take on the role in January 2026.
TrendsOct 03, 2025
Piece of the Week: Kallati’s Pink Sapphire RingTaylor Swift flaunts an Elizabeth Taylor-esque gemstone in promo for her new album, “The Life of a Showgirl.”
CollectionsOct 02, 2025
Boucheron Debuts Cuffs Crafted With 3D-Printed SandIts “Quantre Sand” capsule was made using a 3D sand printing technique borrowed from the automotive and aeronautics industries.
Weekly QuizOct 02, 2025
This Week’s QuizTest your jewelry news knowledge by answering these questions.
CrimeOct 02, 2025
$1M in Jewelry Stolen in Northern California Smash and Grab Four individuals have been charged in the “takeover-style” robbery of Heller Jewelers last month, and additional charges are expected.
MajorsOct 02, 2025
Neil Lane Jewelry Exhibition Coming to Toledo Museum of Art“Radiance and Reverie” will showcase more than 150 jewels from Lane’s personal collection by Tiffany & Co., Cartier, and more.
Brought to you by
reDollar.com Is Rolling Out the Next Level Jewelry, Diamond & Watch Consignment ProgramWith their unmatched services and low fees, reDollar.com is challenging some big names in the online consignment world.
TrendsOct 02, 2025
Amanda’s Style File: October’s Colorful ShowThe month’s birthstones, tourmaline and opal, complement the palette of autumn.
ColumnistsOct 01, 2025
Peter Smith: Why Vendor Success Starts With Self-ReflectionSmith shares the importance of looking at your company with openness and honesty to identify opportunities you may be missing.
EditorsOct 01, 2025
Playing Favorites: The Best Jewelry From VicenzaoroAssociate Editor Natalie Francisco visited Italy to spot jewelry trends at the September Vicenzaoro show and share her top finds.
SurveysOct 01, 2025
Consumer Confidence Hits 5-Month Low in September Respondents were concerned about job availability and rising prices.
SourcingOct 01, 2025
Gemfields’ H1 Revenue Falls 47%Its latest interim financials revealed a challenging first half due in part to production troubles at its mines.
MajorsSep 30, 2025
Pandora CEO to Retire in 2026, Hand Reins to CMO Alexander Lacik has led Pandora since 2019. Berta de Pablos-Barbier will succeed him, the first woman to head the company.
CrimeSep 30, 2025
2 Suspects Charged in $300K Sleight-of-Hand Jewelry Store ScamTwo men allegedly used counterfeit bills to purchase luxury watches and jewelry from a North Carolina jeweler.
CollectionsSep 30, 2025
Billie Eilish, Finneas Partner with John HardyThe “Lovestruck” collection, designed with the Academy and Grammy award-winning siblings, is the brand’s first lab-grown diamond offering.
IndependentsSep 30, 2025
Spinelli Kilcollin Announces Residency in DallasThe brand, celebrating its 15th anniversary, has popped up at Market, a luxury fashion destination in Highland Park Village.
IndependentsSep 29, 2025
Nina Pugliese, Longtime Henne Jewelers Employee, Dies at 65She was remembered as a creative and generous woman of faith, who also had a sweet tooth.
TrendsSep 29, 2025
Amanda’s Style File: Ear FocusMove over neck mess, the ear story is the way to make a layering statement today.
IndependentsSep 29, 2025
Mark Henry Jewelry to Debut in CanadaThe New York-based brand is set to launch a limited-time offering for the holiday season at Holt Renfrew in Toronto.
MajorsSep 29, 2025
Overnight Releases New Bridal CatalogThe “Volume 7” bridal catalog features best-selling engagement rings, trending styles, and a new section highlighting anniversary bands.
SurveysSep 26, 2025
Online Shopping, Influencers to Drive Holiday Spending, Mastercard SaysHoliday sales growth is expected to slow as consumers grapple with inflation and tariff-related uncertainty.
Events & AwardsSep 26, 2025
Winners of Austin Jewelry Design Contest Announced Jamie Turner Designs is among the winners of the local “Austin Shines” contest, hosted by Eliza Page, a jewelry store in Austin, Texas.
TrendsSep 26, 2025
Piece of the Week: Kwit Jewelry’s Square Signet Pinky RingThe red and azure colorway is one of many fun enamel pairings offered, bringing whimsy to the classic style of a monogramed signet ring.
Policies & IssuesSep 25, 2025
JA CEO Provides Tariff Update Following Annual Fly-InA trade deal with Switzerland seems probable, but reaching an agreement with India remains a challenge, David Bonaparte said.
SourcingSep 25, 2025
2 African Countries Aim to Take Stake in De Beers Botswana’s president said his country wants a controlling share, while Angola envisions multiple countries holding minority stakes.
IndependentsSep 25, 2025
Alex Moss’ New Flagship Brings Bold Jewels to SoHoThe jeweler to the stars has worked with Drake, A$AP Rocky, Tyler the Creator, and other celebrities.
