This Is the Biggest Faceted Lab-Grown Diamond GIA’s Ever Seen

Lab-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.

20230508_34 carat lab-grown diamond.jpg
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 … 

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. 

The Latest

Pantone color of the year 2024
TrendsDec 08, 2023
Pantone’s Color of the Year Is Warm and Fuzzy

The peachy hue also marks the program’s 25th anniversary.

Mary Tyler Moore and Elsa Peretti for Tiffany & Co. Bone Cuffs
AuctionsDec 08, 2023
Sotheby’s Sold All Mary Tyler Moore’s Jewelry

The 21 pieces up for auction, including Tiffany & Co. jewels and a Cartier watch, garnered more than $430,000 across two sales.

Inesa Kovalova’s Links pin
CollectionsDec 08, 2023
Piece of the Week: A ‘Strong & Precious’ Brooch

Centered on a sunny heliodor, the “Links” pin was designed by Ukrainian jewelry artist Inesa Kovalova.

De Beers | Diamonds Falling
Brought to you by
The Most Important “C” in Diamonds: Confidence!

Without the ability to instill confidence within the industry and directly to the consumer, a diamond holds very little value.

Lashbrook ring
MajorsDec 07, 2023
Lashbrook Sues Manly Bands for Allegedly Copying Designs

The wedding band company is also accusing its former customer of removing watermarks from Lashbrook images for its own use.

Weekly QuizDec 07, 2023
This Week’s Quiz
Test your jewelry news knowledge with this short test.
Take the Quiz
Rough diamonds from Alrosa
Policies & IssuesDec 07, 2023
The G7’s Long-Awaited Statement on Russian Diamonds Is Here

It provides a timeline for the implementation of new restrictions, but no details.

24 Karat Club of New York new members
MajorsDec 07, 2023
24 Karat Club of New York Welcomes New Members

The organization has elected 12 new additions.

Platinum  Guild International Diamond Rings
Brought to you by
If It’s Custom, Make It Platinum

With holiday proposals right around the corner, encourage your customers to go for platinum when making the big purchase.

National Jeweler columnist Sherry Smith
ColumnistsDec 06, 2023
On Data: How Are Independents Doing So Far This Holiday Season?

Sherry Smith breaks down the numbers on jewelry sales in November and reveals the category that “emerged as a standout.”

133 carat yellow diamond
AuctionsDec 06, 2023
A Yellow Diamond, Hollywood Jewels Stand Out at Sotheby’s

Additional lots will be offered in the Fine Jewels online sale through Dec. 7.

GIA logo
GradingDec 06, 2023
GIA Debuts Revamped Graduate Jeweler Program

By mixing creative and practical skills, the new course hopes to fill the industry’s bench jeweler gap.

A 1930s gem-set and enamel ‘Maltese cross’ cuff attributed to Verdura for Chanel (left) and a loose cushion-cut Burmese sapphire weighing 11.87 carats (right) were the top lots in Bonhams New York Jewels auction this week.
AuctionsDec 06, 2023
Verdura Cuff, Burmese Sapphire Shine at Bonhams

Several other colored gemstones joined the pieces in the top 10 list.

Neil Lane lab-grown diamond engagement ring
FinancialsDec 05, 2023
Signet Jewelers’ Q3 Sales Down 12%

The retailer is still expecting a strong holiday season with improving demand for natural diamonds.

Memorial for slain jeweler Peter Damian Arguello in Wheat Ridge, Colorado
CrimeDec 05, 2023
Police Continue to Investigate Murder of Colorado Jeweler

Peter Damian Arguello, the owner of Peter Damian Fine Jewelry & Antiques, was shot and killed in an apparent robbery last week.

Tanishq store
MajorsDec 05, 2023
Tanishq Continues U.S. Expansion With 2 New Stores

The Indian jewelry giant has opened locations in Houston and Frisco, Texas.

Grandview Klein Diamonds Namibia scholarship winners
SourcingDec 05, 2023
Grandview Klein Awards Two Scholarships in Namibia

Each student was provided with the full amount of tuition for the Namibia University of Science & Technology.

De Beers Ryan Perry and David Prager
SourcingDec 04, 2023
David Prager To Leave De Beers in 2024

Ryan Perry, who has been with De Beers since 2002, also will be leaving the company next year.

Chrono24 ChronoPulse
WatchesDec 04, 2023
Chrono24 Debuts the ‘Dow Jones’ for Luxury Watches

The watch seller’s new index tracks sales data from 14 brands, including Rolex and Patek Philippe.

David Bouffard Signet Jewelers
MajorsDec 04, 2023
David Bouffard to Leave Signet, RJC

The industry veteran will step down from both roles in April 2024.

David Webb turquoise and lapis ring
TrendsDec 04, 2023
Amanda’s Style File: Decadent December

Tanzanite, turquoise, and zircon are all options for December babies, who sometimes “get the birthday shaft,” Amanda Gizzi writes.

Lila Moss Calvin Klein campaign
FinancialsDec 01, 2023
Movado Lowers Guidance Again After Q3 Sales Dip

The company said it is facing a “challenging retail environment” but is prepared for the holiday season.

Muzo emerald and argyle pink diamond necklace
CollectionsDec 01, 2023
Piece of the Week: Muzo’s Emerald and Argyle Pink Diamond Necklace

It’s the hero piece of the newest "Green Jewel" collection, a collaborative offering from the two mines.

Pink Supreme Diamond
AuctionsNov 30, 2023
This Pink Diamond Reigned Supreme in Hong Kong

The 15.48-carat fancy intense “Pink Supreme” topped Christie’s fall jewelry auction in Asia, while a Patek Philippe led the watch sale.

Claire’s CFO COO Chris Cramer
MajorsNov 30, 2023
Claire’s Hires Former Bath & Body Works Exec as CFO, COO

Chris Cramer, who also spent time at Gen Z intimates brand Parade, will take on the dual role.

133 carat yellow diamond
AuctionsNov 30, 2023
Sotheby’s To Auction 133-Carat Yellow Diamond

The stone headlining the upcoming sale could fetch up to $5 million.

Kwiat diamonds
IndependentsNov 30, 2023
Frank Adams Rolls Out Kwiat’s ‘Mine to Shine’ Program

The retail offering lets customers track their diamond’s journey.

Diamond development hub in Angola
SourcingNov 29, 2023
Largest New Diamond Mine of the Decade Coming Online in Angola

The Luele mine is expected to eventually make the country the world’s third-largest diamond producer.


This site uses cookies to give you the best online experience. By continuing to use & browse this site, we assume you agree to our Privacy Policy