Lab-GrownOct 15, 2020
GIA’s New Reports for Lab-Grown Diamonds Are OutLab-GrownJun 04, 2025
GIA Reverting to More General Terminology for Lab-Grown Diamonds
It will quit assigning the stones specific color and clarity grades in favor of applying “new descriptive terminology.”
Starting later this year, GIA will change its approach to lab-grown diamonds once again, abandoning the use of specific color and clarity grades for the stones in favor of assigning them to one of two categories, “premium” or “standard.”
Carlsbad, Calif.—The Gemological Institute of America is once again changing the reports it issues for lab-grown diamonds.
This time, the lab is going right back to where it started from, sort of.
On Monday, GIA announced that beginning later this year, it will quit using the color and clarity nomenclature it developed for natural diamonds in evaluating lab-grown diamonds.
Instead, the lab will, first, confirm that the submitted stone is a laboratory-grown diamond and then evaluate its color, clarity, and finish to determine if it falls into one of two categories: “premium” or “standard.”
If the lab-grown diamond fails to meet the minimum standard for quality, it will not receive a designation from GIA.
The lab said it is making the change in response to the dramatic compression in the range of color and clarity seen in lab-grown diamonds, a change that has come about as a result of continual improvements in diamond-growing technology in recent years.
It also noted that this revision will “help consumers understand the important differences in the two products’ origin, ensuring their confidence and enabling them to make informed and educated purchase decisions.”
GIA said that since 2022, 95 percent of the man-made diamonds submitted to the lab for grading have been colorless, meaning they would receive a grade of D, E, or F, while 98 percent received a clarity grade of VS1 or higher.
Executive Vice President and Chief Laboratory and Research Officer Tom Moses remarked, “Similar to other man-made gem materials, we anticipate the continued acceptance and popularity of laboratory-grown diamonds.
“More than 95 percent of laboratory-grown diamonds entering the market fall into a very narrow range of color and clarity. Because of that, it is no longer relevant for GIA to describe man-made diamonds using the nomenclature created for the continuum of color and clarity of natural diamonds.”
Moses’ remarks echo those he made in a 2016 interview with National Jeweler in which he explained the rationale behind GIA’s approach to grading lab-grown diamonds.
At that time, GIA used broader terms to describe lab-grown diamonds, calling stones in the D-F range “colorless” and those in the G-I range “near colorless,” and using only four clarity grades for the stones, VVS, VS, SI or I, compared with 11 for natural diamonds.
Moses said at the time that GIA chose to do it this way because lab-grown diamonds just aren’t going to have the same color and clarity range as mined diamonds.
To GIA, it didn’t make sense to apply its grading system—which Moses noted was developed for “normal mine run” in the 1940s, long before lab-grown diamonds were hitting the market in the quantities they are today—to man-made diamonds.
Related stories will be right here …
This time, the lab is going right back to where it started from, sort of.
On Monday, GIA announced that beginning later this year, it will quit using the color and clarity nomenclature it developed for natural diamonds in evaluating lab-grown diamonds.
Instead, the lab will, first, confirm that the submitted stone is a laboratory-grown diamond and then evaluate its color, clarity, and finish to determine if it falls into one of two categories: “premium” or “standard.”
If the lab-grown diamond fails to meet the minimum standard for quality, it will not receive a designation from GIA.
The lab said it is making the change in response to the dramatic compression in the range of color and clarity seen in lab-grown diamonds, a change that has come about as a result of continual improvements in diamond-growing technology in recent years.
It also noted that this revision will “help consumers understand the important differences in the two products’ origin, ensuring their confidence and enabling them to make informed and educated purchase decisions.”
GIA said that since 2022, 95 percent of the man-made diamonds submitted to the lab for grading have been colorless, meaning they would receive a grade of D, E, or F, while 98 percent received a clarity grade of VS1 or higher.
Executive Vice President and Chief Laboratory and Research Officer Tom Moses remarked, “Similar to other man-made gem materials, we anticipate the continued acceptance and popularity of laboratory-grown diamonds.
“More than 95 percent of laboratory-grown diamonds entering the market fall into a very narrow range of color and clarity. Because of that, it is no longer relevant for GIA to describe man-made diamonds using the nomenclature created for the continuum of color and clarity of natural diamonds.”
Moses’ remarks echo those he made in a 2016 interview with National Jeweler in which he explained the rationale behind GIA’s approach to grading lab-grown diamonds.
At that time, GIA used broader terms to describe lab-grown diamonds, calling stones in the D-F range “colorless” and those in the G-I range “near colorless,” and using only four clarity grades for the stones, VVS, VS, SI or I, compared with 11 for natural diamonds.
Moses said at the time that GIA chose to do it this way because lab-grown diamonds just aren’t going to have the same color and clarity range as mined diamonds.
To GIA, it didn’t make sense to apply its grading system—which Moses noted was developed for “normal mine run” in the 1940s, long before lab-grown diamonds were hitting the market in the quantities they are today—to man-made diamonds.
GIA first began accepting lab-grown diamonds for grading in 2006.
It announced the first shift in how it approaches the stones after the Federal Trade Commission rolled out its revised Jewelry Guides in 2018. Among the revisions was the removal of the word “synthetic” from the list of recommended terms for referring to lab-grown diamonds.
In light of this update, the lab announced in April 2019 that it would be changing the name of what was then called the GIA Synthetic Diamond Grading Report to the GIA Laboratory-Grown Diamond Report.
It also started including the standard color, clarity and cut grading scales on the reports, but for reference purposes only; the lab did not start grading lab-grown diamonds the same way it did natural stones.
A little more than a year later, that changed.
In August 2020, GIA announced that it would start using the same specific color and clarity grades for both natural and lab-grown diamonds, citing the “growing acceptance in the trade and by consumers of laboratory-grown diamonds as a distinct category.”
Now, nearly five years since that announcement, GIA is pivoting yet again.
This time, the lab is arguably using even broader terminology than it did when it first started accepting lab-grown diamonds for grading nearly 20 years ago.
It is going from using the terms “colorless” or “near colorless” and a limited range of clarity grades to evaluating both qualities together, along with finish, to determine if man-made stones are “premium” or “standard.”
GIA said it is still developing pricing and submission guidelines for its new lab-grown diamond grading service.
It expects to announce more specifics in the third quarter. In the meantime, existing GIA reports for lab-grown diamonds remain valid.
The release does not mention if the reports, or whatever is forthcoming with this new service, will have a different name.
It also does not mention if there will be any changes to the way GIA applies the other two Cs to lab-grown diamonds—carat weight and cut, which is a factor introduced during the manufacturing process and thereby can exist on a broad continuum for both natural and lab-grown diamonds.
GIA said its current services for lab-grown diamonds will continue to be available until the revised descriptive system for lab-grown diamonds is finalized later this year.
Editors' Picks
Sponsored by
More on Lab-Grown
The Latest
CollectionsAug 28, 2026
Dolly Parton Would Have Loved This Butterfly Necklace This Buddha Mama butterfly is our Piece of the Week honoring the legend, who embraced the beautiful insect as her symbol.
SourcingAug 28, 2026
Gareth Penny to Give Opening Speech at CIBJO Centenary CongressThe former De Beers CEO, and perhaps its next owner, will be a featured speaker at the event, slated for Sept. 4-7 in Italy.
IndependentsAug 28, 2026
Day’s Jewelers Honored With 3 Workplace AwardsThe employee-owned jeweler was named a “Best Place to Work” in Maine, New Hampshire, and for women.
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.
CollectionsAug 27, 2026
Pandora Expands ‘Talisman’ Collection as Lawsuit Continues The second iteration of the jewelry collection was inspired by the zodiac and the four elements: earth, water, air and fire.
Weekly QuizAug 27, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
SourcingAug 27, 2026
OFAC Renews License Allowing Import of ‘Grandfathered’ Russian Diamonds General License 104B supersedes General License 104A, which was set to expire on Sept. 1.
CrimeAug 27, 2026
Customs Seizes Nearly 900 Pieces of Counterfeit JewelryThe package, intercepted in Indianapolis, contained fake Cartier, Tiffany & Co., and Van Cleef and Arpels jewelry.
Brought to you by
Why More Jewelry Retailers Are Hosting Turnkey Estate Buying EventsRetailers are seeking new ways to attract customers, increase traffic, and create revenue – Estate buying events are a popular solution.
IndependentsAug 27, 2026
Jessica McCormack to Open First West Coast StoreThe new location in Costa Mesa, California, marks the brand’s second store in the United States and fourth standalone location worldwide.
FinancialsAug 27, 2026
Movado’s Q2 Sales Up As Younger Consumers Take Interest in WatchesThe fashion watch category was once threatened by the Apple Watch, but consumers are now opting for new wearables, said Movado’s CEO.
SurveysAug 26, 2026
5 Jewelry Insights From The RealReal’s Resale ReportThe report delves into trending styles, the most popular jewelry brands by city, and why Belle Époque jewelry could be the next big thing.
SurveysAug 26, 2026
Consumer Confidence Dips in August Amid Anticipatory Anxieties Respondents were concerned about the future of the labor market and their income as well as the rising prices of gas and groceries.
TrendsAug 26, 2026
Boucheron’s New Campaign Celebrates Its ‘Question Mark’ NecklacesThe campaign highlights the asymmetrical high jewelry necklace style that the jeweler first created in 1879.
Events & AwardsAug 26, 2026
Harry Winston Exhibition to Open in ShanghaiIt will explore the life of “The King of Diamonds” and showcase more than 165 creations from the brand.
CrimeAug 25, 2026
Florida Woman Scammed Out of $1.5M in Jewelry, Precious MetalsTwo suspects have been arrested in connection with the complex phone scam.
ColumnistsAug 25, 2026
Proof Before Purchase: The Gen Z Way to BuyIn her first column for National Jeweler, Jennifer Shaheen asks jewelers if they know how to connect with the next generation of consumers.
Events & AwardsAug 25, 2026
SSEF Opens 2026 Applications for Gemology Education ScholarshipsThe annual awards cover tuition for an on-site educational course at the Swiss lab, as well as flights and lodging.
TrendsAug 25, 2026
Brent Neale Celebrates Blackberry Farm’s Anniversary With JewelryThe jeweler partnered with the Tennessee resort to honor its 50th anniversary with limited-edition blackberry pendants and earrings.
EditorsAug 24, 2026
Q&A: Reeds Jewelers VP Genna Zimmer on 80 Years in BusinessThe third-generation jeweler shared how the North Carolina retailer is celebrating this milestone and the love story that started it all.
Events & AwardsAug 24, 2026
Rio Grande, MetalWerx Host Argentium Silver WorkshopThe class, led by renowned metalsmith Cynthia Eid, highlighted Argentium silver as an alternative to gold amid high prices.
Events & AwardsAug 24, 2026
JIS Miami Opens Fall 2026 RegistrationThe show is slated for Oct. 16-19 at the Miami Beach Convention Center.
CollectionsAug 24, 2026
Francesca Villa Honors Napoleon, His Empresses In New CapsuleThe “Empresses” capsule uses 19th-century medals depicting Napoleon, Joséphine, and Marie-Louise across five one-of-a-kind pieces.
SurveysAug 21, 2026
These Are 2026’s Hottest Retailers, Says NRFThe retailers at the top of the list offer affordable products and fun, discovery-fueled experiences.
WatchesAug 21, 2026
Bremont Names Former Vacheron Constantin Exec CMODaniel Bing was formerly the marketing director for the Americas at Vacheron Constantin.
CollectionsAug 21, 2026
Bijules, Kamyen Serve Up ‘Topspin’ Tennis Bracelet Ahead of US OpenIn our Piece of the Week, the designers reimagine the tennis bracelet with green enamel wrapped around a strand of “Desert Diamonds.”
PodcastsAug 20, 2026
Episode 8: Diamond Industry Update With David Bonaparte & Ronnie VanderLindenThe industry veterans join the podcast to discuss diamond marketing, the FTC Jewelry Guides, and lobbying for lower tariffs.
TechnologyAug 20, 2026
A New AI-Powered Gemstone Identification App Is HereFounder Vik Westermann said the app is a “starting point” to inspire people to work with appraisers and gem labs, not replace them.
