Natural Diamond Council: In a major victory for consumer transparency and the global natural diamond industry, the Natural Diamond Council (NDC) has successfully challenged misleading advertising practices by synthetic diamond retailers in the United Kingdom. The UK’s advertising regulator has ruled that companies selling laboratory-grown diamonds must clearly disclose the synthetic nature of their products, reinforcing stricter standards for jewellery marketing and consumer protection.
UK Advertising Watchdog Rules Against Synthetic Diamond Retailers
The Natural Diamond Council announced on May 15, 2026, that the UK’s Advertising Standards Authority (ASA) upheld complaints filed against two jewellery retailers — UK-based Novita Diamonds and Hong Kong-based Linjer Ltd — for failing to clearly identify their products as laboratory-grown diamonds.
The not-for-profit organisation, which works to protect and promote the integrity of the global natural diamond industry, argued that the advertisements misled consumers by using the term “diamond” without proper qualifiers such as “synthetic,” “laboratory-grown,” or “laboratory-created.”
On May 13, 2026, the ASA ruled that both companies had breached the UK Code of Non-broadcast Advertising and Direct & Promotional Marketing (CAP Code).
As part of the ruling, both companies were instructed to remove the advertisements and ensure they do not appear again in the same format. The regulator also directed the retailers not to use the term “diamond” in isolation when referring to synthetic diamonds without a clear and prominent qualifier.
Natural Diamond Council Calls It a “Victory for Consumers”
Reacting to the ruling, Natural Diamond Council CEO Amber Pepper said, “This is a victory for consumers, Diamonds carry deep emotional significance and are often bought to mark life’s meaningful moments. It’s vital that consumers can make informed choices in total confidence. This is not the first time we have successfully challenged advertising that blurs the distinction between mass-produced products grown in a factory and products of nature formed deep in the Earth over billions of years. We applaud the regulator for once again standing up for consumers – something we too will continue to do as part of our wider mission to educate and inspire people on the values of natural diamonds and their positive impact.”
Details of the Novita Diamonds Advertisements
he ASA’s ruling against Novita Diamonds focused on two paid Meta advertisements.
- The first ad displayed a diamond engagement ring alongside the text:
“Novita Diamonds Ready-to-Ship Engagement Rings 1-10 days.” - The second advertisement featured a video showcasing diamond rings with on-screen phrases including:
“Premium Diamonds”
and
“Shop our ready-to-ship collection today – Novita Diamonds.”
The regulator concluded that the advertisements failed to make it sufficiently clear that the products being marketed were synthetic diamonds.
Linjer Google Ads Also Found Misleading
The complaint against Hong Kong-based Linjer Ltd related to two paid Google advertisements. Both ads included the phrase:
“Discover our brilliant diamonds.”
The ASA determined that the wording could mislead consumers into believing the products were natural diamonds because the advertisements did not prominently clarify that the diamonds were laboratory-grown
Key Diamond Terminology Guidelines Referenced by ASA
In both rulings, the ASA referenced the National Association of Jewellers’ (NAJ) Diamond Terminology Guideline, which is recognised and assured by UK Trading Standards.
The guidelines state that companies selling synthetic diamonds must:
Use authorised qualifiers such as:
- “synthetic”
- “laboratory-grown”
- “laboratory-created”
- Avoid abbreviations such as:
- “lab-grown”
- “lab-created”
- Avoid terms including:
- “cultured diamonds”
- “cultivated diamonds”
because these terms are associated with organic or biogenic products. The guidance also prohibits the use of words such as:
- “real”
- “genuine”
- “precious”
- “authentic”
- “natural”
when referring to synthetic diamonds, as these terms apply exclusively to naturally formed minerals and gemstones.
ASA Clarifies Rules for Jewellery Advertisements
The ASA stated that whether a diamond is natural or synthetic is a crucial factor for many consumers when making purchasing decisions.
Because of this, the regulator ruled that companies must provide this information clearly within the advertisement itself, rather than only disclosing it later on a website after consumers click the ad.
The Novita Diamonds ruling also clarified that even if an advertisement does not explicitly mention the word “diamond,” a qualifier is still required if the brand name itself includes the term “Diamonds.”
Meanwhile, the ruling against Linjer demonstrates that UK advertising rules apply to overseas companies targeting UK consumers through paid media platforms such as Meta and Google.
London Diamond Bourse Supports the Decision
David Troostwyk, President of the London Diamond Bourse, which jointly filed the latest complaints alongside the Natural Diamond Council, said the rulings should send a strong message to manufacturers and retailers.
According to Troostwyk, misleading advertising unfairly exploits the emotional and timeless value associated with natural diamonds while confusing consumers. He added that irresponsible advertising practices should not be tolerated within the jewellery industry.
About the Natural Diamond Council
The Natural Diamond Council (NDC) is a global not-for-profit organisation focused on educating consumers about the rarity, authenticity, and responsible sourcing of natural diamonds.
Its platform, “Only Natural Diamonds,” publishes content related to:
- Diamond buying guides
- Jewellery trends
- Celebrity and pop culture stories
- Engagements and weddings
- Educational resources and myth-busting facts
The organisation also provides marketing and educational support to jewellery brands, retailers, and designers to promote the integrity and value of natural diamonds.
FAQ’s
1. What action did the Natural Diamond Council take against synthetic diamond retailers?
The Natural Diamond Council (NDC) filed complaints with the UK’s Advertising Standards Authority (ASA) against Novita Diamonds and Linjer Ltd for allegedly misleading consumers by advertising laboratory-grown diamonds without clearly identifying them as synthetic products.
2. What did the UK Advertising Standards Authority rule in this case?
The ASA ruled that both companies breached the UK Code of Non-broadcast Advertising and Direct & Promotional Marketing (CAP Code). The regulator ordered the companies to remove the advertisements and instructed them not to use the word “diamond” without clear qualifiers such as “synthetic” or “laboratory-grown.”
3. Why are the ASA rulings considered significant for consumers?
The rulings are seen as important because they reinforce transparency in jewellery advertising and help consumers clearly distinguish between natural diamonds and laboratory-grown diamonds. Regulators stated that the nature of a diamond is a key factor influencing consumer purchasing decisions.
4. What terminology guidelines must synthetic diamond sellers follow?
According to the National Association of Jewellers’ Diamond Terminology Guideline, retailers must use approved terms such as “synthetic,” “laboratory-grown,” or “laboratory-created.” They are also prohibited from using misleading words like “natural,” “genuine,” “authentic,” or “precious” for synthetic diamonds.
5. How could these rulings impact the global jewellery and diamond industry?
Industry experts believe the rulings could push jewellery retailers worldwide to adopt stricter disclosure standards for synthetic diamonds. The decisions may also strengthen consumer trust, improve transparency in diamond marketing, and increase regulatory scrutiny of online and digital jewellery advertisements.
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