EditorsDec 13, 2021
Out & About: Watching De Beers Grow Diamonds in OregonLab-GrownFeb 02, 2022
GIA Examines Largest Known Diamond Grown Using CVD
It is more than 16 carats and G color/VVS2 clarity as grown, which is unusual in CVD diamonds.
This 16.41-carat princess-cut diamond produced using the CVD process measures 13.97 × 13.87 × 9.56 mm. Recently examined and graded by GIA, it is G color and VVS2 clarity. (Photo credit: Towfiq Ahmed)
Carlsbad, Calif.—Scientists at the Gemological Institute of America recently examined what is believed to be the largest diamond grown using the chemical-vapor deposition process, breaking a record set just last year.
The lab said Tuesday that the diamond is a 16.41-carat princess-cut stone grown by Shanghai Zhengshi Technology Co. Ltd.
The diamond had the “observable characteristics” of diamonds grown using the CVD process, including strong graining throughout—common in CVD stones—that gives the diamond a “wavy” appearance, as visible in the video below.
The lab said Tuesday that the diamond is a 16.41-carat princess-cut stone grown by Shanghai Zhengshi Technology Co. Ltd.
The diamond had the “observable characteristics” of diamonds grown using the CVD process, including strong graining throughout—common in CVD stones—that gives the diamond a “wavy” appearance, as visible in the video below.
The 16.41-carat lab-grown diamond is exceptional for another reason in addition to its size.
The diamond is G color and VVS2 clarity. GIA confirmed through detailed spectroscopic readings it was not treated post-growth to improve its color, which is unusual.
GIA Vice President of Research and Development Dr. Wuyi Wang, who examined the diamond, noted, “We have seen very few CVD diamonds of this quality.”
The 16.41-carat stone breaks the previous record for largest CVD diamond—a 14.60-carat emerald-cut stone produced in India and reported on by the International Gemological Institute in August 2021—by nearly two carats.
And it tops the record-holder before that, a 12.75-carat round brilliant lab-grown diamond, by almost four carats.
In article on the 16.41-carat lab-grown diamond authored by Wang and GIA research associates Stephanie Persaud and Elina Myagkay, the authors noted how the technology behind both CVD and high-pressure, high-temperature growth processes for diamonds has advanced significantly in the last two decades.
Wang noted in a GIA news release that he first examined a CVD diamond back in 2003, and it was less than half a carat, pear shaped and brown.
“This 16.41-carat laboratory-grown diamond demonstrates the advances in CVD growth technology. This achievement has important implications for the many scientific and industrial applications for high-quality laboratory-grown diamonds,” he said.
The article is available on the GIA’s website. It also will be published in an upcoming issue of Gems & Gemology, GIA’s quarterly research journal.
Related stories will be right here …
The diamond is G color and VVS2 clarity. GIA confirmed through detailed spectroscopic readings it was not treated post-growth to improve its color, which is unusual.
GIA Vice President of Research and Development Dr. Wuyi Wang, who examined the diamond, noted, “We have seen very few CVD diamonds of this quality.”
The 16.41-carat stone breaks the previous record for largest CVD diamond—a 14.60-carat emerald-cut stone produced in India and reported on by the International Gemological Institute in August 2021—by nearly two carats.
And it tops the record-holder before that, a 12.75-carat round brilliant lab-grown diamond, by almost four carats.
In article on the 16.41-carat lab-grown diamond authored by Wang and GIA research associates Stephanie Persaud and Elina Myagkay, the authors noted how the technology behind both CVD and high-pressure, high-temperature growth processes for diamonds has advanced significantly in the last two decades.
Wang noted in a GIA news release that he first examined a CVD diamond back in 2003, and it was less than half a carat, pear shaped and brown.
“This 16.41-carat laboratory-grown diamond demonstrates the advances in CVD growth technology. This achievement has important implications for the many scientific and industrial applications for high-quality laboratory-grown diamonds,” he said.
The article is available on the GIA’s website. It also will be published in an upcoming issue of Gems & Gemology, GIA’s quarterly research journal.
Another lab-grown diamond record was set recently, this one for a rough stone that was examined by IGI.
The lab said Jan. 20 that it recently analyzed a 150.42-carat blue diamond grown by biotech company Meylor Global using the HPHT method.
It is the heaviest rough lab-grown diamond on record, breaking the previous benchmark of 115 carats, also set by Meylor Global in September 2020.
The record for a faceted and colorless/near-colorless HPHT-grown diamond is 15.32 carats, tested by GIA in 2018.
The 150-carat diamond is gem-quality, IGI and Meylor confirmed, but Meylor hasn’t decided what it will do with the diamond.
IGI also noted that it recently examined another large lab-grown diamond from Meylor, this one a gray diamond weighing 141.58 carats.
Pictured at right is the 150.42-carat lab-grown rough diamond produced by Meylor Global, while the 141.58-carat stone is pictured at right.
Like GIA, IGI noted that the technology used to grow diamonds continues to improve.
“The acceleration of technology in the lab-grown diamond sector is significant,” said John Pollard, IGI’s recently appointed director of education.
“In addition to record-setting weights, they’re type IIb crystals, a semiconducting category associated with diamond-based electronics. At IGI, we’re seeing new benchmarks from the world’s most advanced producers in jewelry applications and beyond.”
More on Lab-Grown
The Latest
IndependentsDec 07, 2022
How Daniel’s Jewelers Has Lasted 70+ Holiday SeasonsIn a Q&A, CEO David Sherwood shares some company history, the secret to success during the busiest time of year, and more.
TrendsDec 07, 2022
Amanda’s Style File: December BluesJewelers of America’s Amanda Gizzi spotlights her favorite turquoise, tanzanite, and zircon December birthstone jewelry.
IndependentsDec 07, 2022
The Radiance Lands at Marissa CollectionsThe retailer is now selling the 13 diamond jewelry capsule collections created by BIPOC designers on its website.
Brought to you by
How To Buy Colored GemstonesGive your customers the full gemstone buying experience by using the 6C's.
AuctionsDec 07, 2022
Christie’s Magnificent Jewels Auction Totals Nearly $59M in New YorkAfter a 13-carat pink diamond was pulled ahead of the sale, blue and colorless diamonds reigned supreme.
Weekly QuizDec 01, 2022
This Week’s QuizTest your knowledge of the latest jewelry news with this quick test.
FinancialsDec 06, 2022
Signet Anticipates Solid Holiday Season, Raises GuidanceThe jewelry giant posted a decline in same-store sales in the third quarter but is gearing up for a season of growth.
TrendsDec 06, 2022
Pantone’s 2023 Color of the Year Is A Lot Like Rubellite, Spinel, Ruby“Viva Magenta” easily finds its colored gemstone counterparts.
Brought to you by
Knowledge and Skills for Today’s Hot TopicsFrom laboratory-grown diamonds to design to country-of-origin, GIA's Alumni Collective™ has a seminar to suite your needs.
AuctionsDec 06, 2022
Jewels from the Sunken ‘Ship of Gold’ Smash Auction EstimatesHolabird Western Americana Collections offered hundreds of treasures recovered from the S.S. Central America in its Dec. 3 sale.
ColumnistsDec 06, 2022
The Smart Lab: 6 Holiday Email Marketing Strategies To Boost SalesFrom creating catchy subject lines to retargeting abandoned carts, Emmanuel Raheb has a half-dozen pieces of email marketing advice.
IndependentsDec 06, 2022
CD Peacock Names VP of Client Engagement, ExperienceQi Holtzman is a member of the second generation to run the family-owned Chicago area jeweler.
IndependentsDec 05, 2022
Holocaust Survivor and Jeffrey Mann Jewelers Matriarch Rena Mann Dies Mann, who opened the Ohio jewelry store with her husband and son in 1984, was 95.
TechnologyDec 05, 2022
Timex Ticks into the Metaverse with Bored Ape Yacht ClubThe watch brand will create 500 custom timepieces for holders of Bored Ape Yacht Club NFTs.
EditorsDec 05, 2022
Meet Jewelry’s First TikTok StarWhen it comes to translating luxury into the social media platform’s approachable style, JewelsWithJules has cracked the code.
Events & AwardsDec 05, 2022
WJA Foundation Awards Nearly $60K in Scholarships for 2022-2023Scholarship winners received awards in six different categories.
SourcingDec 02, 2022
Alrosa CEO Sergey Ivanov to Step Down, Report SaysAccording to Russian news sources, the sanctioned head of the diamond company is leaving to take a job with an investment group.
SourcingDec 02, 2022
Lucapa Sells 170-Carat Pink Diamond Unearthed This SummerSaid to be the largest pink diamond found in hundreds of years, “The Lulo Rose” was sold for an undisclosed sum.
AuctionsDec 02, 2022
Here’s How 2 Royal Jewels Performed at Auction in DenmarkA princess’s tiara fell within its pre-sale estimate while an Art Deco bracelet from a queen doubled it.
CollectionsDec 02, 2022
Piece of the Week: Foundrae’s Chain A closer look at the bold links reveals a subtle, surprising detail.
Supplier BulletinDec 01, 2022
Take Your Jewelry Design Process Digital with the GIA Alumni Collective™Sponsored by GIA Alumni Collective™
WatchesDec 01, 2022
Rolex to Certify Pre-Owned WatchesRetailers within its official distribution network will be able to sell the authenticated timepieces.
CollectionsDec 01, 2022
Kendra Scott’s New Collection is for Barbie GirlsThe capsule collection combines the brand’s classic styles with Barbie’s signature pink color.
AuctionsDec 01, 2022
13-Carat Pink Diamond Withdrawn From Christie’s Auction The auction house is not offering any details on why the fancy vivid pink stone was pulled from its upcoming “Magnificent Jewels” sale.
SourcingDec 01, 2022
Nomad’s Is Selling Its Stones to Raise Money for Ukraine AgainIn the spirit of an advent calendar, “Gems to Help Ukraine” will sell a stone a day through Dec. 24 on the Nomad’s Instagram account.
GradingDec 01, 2022
PhotoScribe Granted Patent for Method that Verifies a Stone’s IdentificationThe secure mark combines an overt mark with a covert data set to provide assurance on a gem.
SurveysNov 30, 2022
5 Things Retailers Should Know About the Start to the Holiday SeasonPlus, what a potential rail strike would mean for retailers.
WatchesNov 30, 2022
Watchfinder & Co. Will Launch a Marketplace Next Year It will provide a place for select luxury watch retailers to sell their stock.
