SourcingApr 10, 2024
Compliance, Caution, and Concern: The Current Outlook of Indian Diamantaires Policies & IssuesApr 17, 2024
NDC Prevails in U.K. Case Over Lab-Grown Diamond Advertising
NDC filed a complaint against Skydiamond for use of phrases like “diamonds made entirely from the sky.”
The U.K.’s Advertising Standards Authority upheld the Natural Diamond Council’s complaint against U.K.-based retailer Skydiamond. The NDC alleged that Skydiamond’s marketing claims, such as referring to its lab-grown diamonds as “diamonds made entirely from the sky,” were misleading to consumers, and the ASA agreed.
Editor’s Note: This story was updated post-publication to include comment from Skydiamond.
London—The U.K.’s Advertising Standards Authority (ASA) announced it has upheld the Natural Diamond Council’s complaint against retailer Skydiamond for misleading marketing and advertisement of lab-grown diamonds.
The online fine jewelry retailer uses a patented process to create diamonds from atmospheric carbon dioxide and rainwater using renewable energy from solar and wind power, its website states.
The NDC’s complaint alleged that it was misleading for Skydiamond to use the terms “Skydiamonds,” “diamonds,” and “diamonds made entirely from the sky” in ads it featured in early 2023 in press, on its Instagram, and on its website.
It also called into question the use of the words “real diamond” in a section of the retailer’s FAQ page that answered the question “Are Skydiamonds real diamonds?” with “Each Skydiamond is a perfectly formed real diamond.”
In its ruling, the ASA, which is the U.K. equivalent of the Federal Trade Commission (FTC), sided with NDC, stating that the ads did not make it clear that the diamonds were lab grown.
It also said the above terms were misleading, and the ads breached the U.K. Code of Non-Broadcast Advertising, Sales Promotion and Direct Marketing rules 3.1 and 3.3, with regards to misleading advertising, and 3.9, with regards to qualification.
The code states, “marketing communications must not mislead the consumer by omitting material information. They must not mislead by hiding material information or presenting it in an unclear, unintelligible, ambiguous, or untimely manner.”
All of Skydiamond’s ads included clear gemstones and references to diamonds, the ruling said, and it considered consumers would understand “diamond” in insolation to mean a naturally occurring mineral of crystallized carbon.
While some consumers would be aware that diamonds could be manufactured in a lab, ASA said, many would not.
ASA directed Skydiamond not to use the above terms to describe their lab-grown diamonds without a clear and prominent qualifier, such as “synthetic,” “laboratory-grown” or “laboratory-created,” or another way of conveying the same meaning to consumers in a direct and obvious manner.
It also told the retailer the ads must not appear again in the form complained about, and to not use the claim “real diamonds” to describe lab-grown diamonds.
Skydiamond said it plans to appeal the ruling, calling it “a mistake.”
“Our website and all of our marketing, indeed our very name, make clear that our diamonds come from the sky, we make them or mine them from the sky," said Dale Vince, founder of Skydiamond.
"We make that very clear. Nobody could possibly think they are conventional stones ripped from the bowels of the earth at enormous environmental cost, and nobody actually has. This complaint is not based on actual confusion on the part of customer; it comes from the trade body for diamond mining companies, [and] it is an attempt to use the ASA for anti-competitive purposes and it utterly baseless."
Related stories will be right here …
London—The U.K.’s Advertising Standards Authority (ASA) announced it has upheld the Natural Diamond Council’s complaint against retailer Skydiamond for misleading marketing and advertisement of lab-grown diamonds.
The online fine jewelry retailer uses a patented process to create diamonds from atmospheric carbon dioxide and rainwater using renewable energy from solar and wind power, its website states.
The NDC’s complaint alleged that it was misleading for Skydiamond to use the terms “Skydiamonds,” “diamonds,” and “diamonds made entirely from the sky” in ads it featured in early 2023 in press, on its Instagram, and on its website.
It also called into question the use of the words “real diamond” in a section of the retailer’s FAQ page that answered the question “Are Skydiamonds real diamonds?” with “Each Skydiamond is a perfectly formed real diamond.”
In its ruling, the ASA, which is the U.K. equivalent of the Federal Trade Commission (FTC), sided with NDC, stating that the ads did not make it clear that the diamonds were lab grown.
It also said the above terms were misleading, and the ads breached the U.K. Code of Non-Broadcast Advertising, Sales Promotion and Direct Marketing rules 3.1 and 3.3, with regards to misleading advertising, and 3.9, with regards to qualification.
The code states, “marketing communications must not mislead the consumer by omitting material information. They must not mislead by hiding material information or presenting it in an unclear, unintelligible, ambiguous, or untimely manner.”
All of Skydiamond’s ads included clear gemstones and references to diamonds, the ruling said, and it considered consumers would understand “diamond” in insolation to mean a naturally occurring mineral of crystallized carbon.
While some consumers would be aware that diamonds could be manufactured in a lab, ASA said, many would not.
ASA directed Skydiamond not to use the above terms to describe their lab-grown diamonds without a clear and prominent qualifier, such as “synthetic,” “laboratory-grown” or “laboratory-created,” or another way of conveying the same meaning to consumers in a direct and obvious manner.
It also told the retailer the ads must not appear again in the form complained about, and to not use the claim “real diamonds” to describe lab-grown diamonds.
Skydiamond said it plans to appeal the ruling, calling it “a mistake.”
“Our website and all of our marketing, indeed our very name, make clear that our diamonds come from the sky, we make them or mine them from the sky," said Dale Vince, founder of Skydiamond.
"We make that very clear. Nobody could possibly think they are conventional stones ripped from the bowels of the earth at enormous environmental cost, and nobody actually has. This complaint is not based on actual confusion on the part of customer; it comes from the trade body for diamond mining companies, [and] it is an attempt to use the ASA for anti-competitive purposes and it utterly baseless."
The NDC, which filed in March 2023, based its complaint on the Diamond Terminology Guideline, a reference document that, as of 2020, is assured and recognized by Trading Standards in the U.K. market.
The U.K.’s National Association of Jewellers, along with leading industry organizations, have endorsed the guideline, which is built on the ISO 18323 Standard (“Jewellery – Consumer confidence in the diamond industry”) and the CIBJO Diamond Blue Book.
The FTC has its own rules on diamond terminology, but it is not recognized for diamonds sold outside the United States.
The Diamond Terminology Guideline states that all documents, websites, and other means of communication intended to sell, buy, and promote natural diamonds, lab-grown diamonds, gemstones, lab reports, and natural and lab-grown diamond jewelry must use “synthetic,” “laboratory-grown” or “laboratory-created” when referring to lab-grown diamonds, a directive the ASA references in its ruling.
In one section of its lengthy response to NDC’s complaint, Skydiamond called the guideline a tool that “should not be, and did not profess to be, the only basis for defining the origin of a diamond or for determining definitively whether diamond ads were misleading to an average consumer.”
Skydiamond also argued that of the 23 steps in its “novel and innovative” production process, only the CVD step was shared with conventional lab-grown diamond production processes, and commercialization of its process post-dated the introduction of the Diamond Terminology Guideline, so it was not considered for inclusion.
The ASA acknowledged in its ruling that the guideline had been updated in 2023, but there were no major changes to the 2020 version.
And, although it agrees Skydiamond’s production process differs from other diamond growers, ASA said the diamonds were lab grown nonetheless and consumers needed to know that before making a transactional decision.
The NDC’s complaint to the ASA regarding misleading terminology in advertisements for lab-grown diamonds initially included three other U.K. retailers—Stephen Webster, Lark & Berry, and Idyl.
According to NDC, ASA dropped its case against Stephen Webster but did note that its ruling in the Skydiamond case also applies to Stephen Webster’s marketing and communications.
A spokesperson for Stephen Webster said the company had no comment on the ruling.
The ASA investigated ads from the other two retailers and considered them to be in breach of code—Lark & Berry for the use of “cultured diamond” and “diamond” without a qualifier when referring to synthetic diamonds, and Idyl for the use of the terms “diamonds,” “diamond sparkle,” “fine diamond jewelry,” “sustainable diamonds,” and “Diamonds of the Future” in the same context.
Lark & Berry agreed to amend the ads with qualifiers such as “synthetic,” “laboratory-grown,” and “laboratory-created.”
Idyl also agreed to amend their advertisements that targeted U.K. consumers.
Both rulings have been published as informally resolved on ASA’s website.
More on Policies & Issues
The Latest
Events & AwardsMar 17, 2026
The Best Moments From the 2026 Gem Awards Held just before the Oscars, the jewelry industry’s big awards show had its share of standout jewelry, gowns, and acceptance speeches.
SourcingMar 17, 2026
Cruzeiro Mine Debuts ‘Winter Tourmaline’The Brazilian mine’s new collection features cabochons in soft, muted shades like silver and lilac.
TrendsMar 17, 2026
Natalie Portman Is Tiffany & Co.’s New AmbassadorThe Academy Award-winning actress stars in Tiffany & Co.’s latest commercial, which debuted Sunday night during the Oscars.
Brought to you by
Is This You? Every Jeweler Has This Problem; We Have the Solution.Every jeweler faces the same challenge: helping customers protect what they love. Here’s the solution designed for today’s jewelry business.
MajorsMar 17, 2026
Kering Establishes Jewelry Division, Appoints CEOThe organizational change follows Kering’s promise of a transformation after declining sales in 2025.
Weekly QuizMar 12, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
EditorsMar 16, 2026
2026 Oscars Jewelry: One Necklace After AnotherNatalie Francisco rounds up the top Oscars jewels, including Rose Byrne’s Taffin necklace with a more than 20-carat yellow-brown diamond.
WatchesMar 16, 2026
TAG Heuer Has a New CEOBéatrice Goasglas has been with TAG Heuer since 2018. She is the first woman to head the 166-year-old, LVMH-owned watch brand.
Brought to you by
DCA Enters a New Chapter in Jewelry EducationWith refreshed branding, a new website, updated courses, and a pathway for growth, DCA is dedicated to supporting retail staff development.
IndependentsMar 16, 2026
Ben Bridge Debuts New Honolulu BoutiqueThe store features the first in-store build for the jeweler’s in-house “Bella Ponte” bridal brand.
AuctionsMar 16, 2026
Bonhams Paris To Offer Antique, Signed Jewels The live fine jewelry auction will take place later this week, showcasing antique pieces, rare gemstones, and signed jewels.
CollectionsMar 13, 2026
A Trio of Jewels from the 3 Gem Award Nominees for Jewelry DesignOur Pieces of the Week honor the 2026 nominees for the Gem Award for Jewelry Design, Silvia Furmanovich, Cece Fein-Hughes, and Catherine Sarr.
WatchesMar 13, 2026
Citizen, Vera Wang to Launch Watch CollectionThe 24-piece watch collection is set to debut in spring 2027.
SourcingMar 13, 2026
Andrea Pooler Joins Third-Generation Diamond Company as COO Pooler, who has more than 25 years’ experience in jewelry, is now chief operating officer of Modani Jewels, Soham Diamonds, and SNJ Creations.
MajorsMar 13, 2026
24 Karat Club of New York’s Banquet to Return to Waldorf AstoriaThe reopening of the Waldorf Astoria means a homecoming for the industry group’s annual event, which will take place Saturday.
CollectionsMar 12, 2026
Jessica McCormack Sends Gold, Gemstones Into ‘Orbit’McCormack looked to the 19th century’s “golden age” of astronomy when designing her new celestial-themed collection.
Events & AwardsMar 12, 2026
Johnny Nelson Wins David Yurman Gem Awards GrantNelson will be honored as the inaugural grant winner at the Gem Awards gala on Friday.
TechnologyMar 12, 2026
Caratwise Launches, Names Former Signet Exec CEO The new smart design software allows jewelers to configure, price, and confirm a custom engagement ring in real time for in-store customers.
SourcingMar 12, 2026
Grandview Klein Opens New Factory in South Africa The 10,000-square-foot diamond manufacturing facility officially opened in late February and employs 50 people.
Events & AwardsMar 12, 2026
MJSA ‘Future of Jewelry Making’ Scholarship Applications OpenThe MJSA Education Foundation’s scholarships support students pursuing jewelry careers.
AuctionsMar 11, 2026
‘Spectacular’ 26-Carat Diamond Going Up for Auction in London The largest white diamond to come to market in the U.K. in more than a decade, the VVS1, I-color stone is expected to top $1 million.
TechnologyMar 11, 2026
Cast Jewelry’s Rachel Skelly on Coming Back Online Only Skelly shares her plans for reimagining the fine jewelry retailer she re-acquired after it faltered last year.
CollectionsMar 11, 2026
Pyrrha Highlights ‘The Space Between’ In New CollectionThe collection takes inspiration from the emotional space between people, moments, and experiences.
IndependentsMar 11, 2026
From the Jazz Age to the Information Age: London Jewelers Turns 100In 2026, the jewelry retailer is celebrating a milestone only a small percentage of family-owned businesses survive to see.
IndependentsMar 11, 2026
Virginia Jewelers Raise Nearly $30K for Children’s HospitalThe group of jewelers held a jewelry raffle in support of the Children’s Hospital of Richmond at VCU.
FinancialsMar 10, 2026
Signet Jewelers’ Q4 Sales Fall Flat The jewelry giant released preliminary results for the fourth quarter and full year on Monday, with final results slated to come next week.
MajorsMar 10, 2026
Saks Global to Close 15 More StoresThe retailer also gave an update on its vendor partnerships.
TrendsMar 10, 2026
Messika Names Julianne Moore as AmbassadorThe award-winning actress is the “epitome of modern allure,” the brand said.
