12 Lab-Grown Diamond Myths, Busted
Fake? Cloudy? Always green? Worthless? Twelve things people say about lab-grown diamonds, checked against the facts, including the myths that flatter them.
Few products attract as many myths as lab-grown diamonds, some unfairly negative and some unfairly flattering. Here are twelve claims we hear often, checked against the facts.
Myths that sell them short
1. "They're fake."
False. A lab-grown diamond is real diamond: pure carbon with the same crystal structure, hardness and sparkle. Fakes (simulants) are different materials such as cubic zirconia or moissanite.
2. "They go cloudy."
False. Diamonds do not change. A cloudy look comes from dirt and oil on the surface, which cleaning removes.
3. "They're less durable."
False. Same hardness (10 on the Mohs scale), same toughness.
4. "Experts can tell at a glance."
False. Only laboratory instruments can distinguish them; that is why reports and inscriptions matter.
Myths that flatter them
5. "They're always eco-friendly."
Not automatically. They avoid mining, but growing takes a lot of electricity; the footprint depends on the energy source.
6. "They're a good investment."
False. Prices for new lab-grown stones keep falling and resale value is low. Buy to wear, not to sell.
7. "They're all flawless."
False. Lab-grown diamonds have inclusions too, from tiny dark pinpoints to growth lines. Clarity grading still matters.
8. "Every lab diamond is top quality."
False. Cut quality varies a lot. A badly cut lab-grown stone looks as dull as a badly cut mined one.
Myths about buying them
9. "Certificates don't matter for lab-grown."
False. An independent report confirms quality and origin, and is your proof of what you bought.
10. "You can't get them in colours."
False. Pink, blue, yellow and green lab-grown diamonds are widely available.
11. "They don't need to be disclosed."
False. In the USA, UK, EU and elsewhere, sellers must clearly disclose that a diamond is lab-grown.
12. "Nobody wants them for engagement rings."
Far from it. Lab-grown diamonds have become a mainstream engagement ring choice in the USA and elsewhere.
The honest case for lab-grown is simple: a real diamond, for less. It does not need exaggerating.Zarna Jewels
Where the myths come from
Most myths start as marketing. Some mined-diamond messaging has implied that lab-grown stones are not "real", while some lab-grown sellers have made sweeping claims about sustainability that they cannot support. Regulators such as the US Federal Trade Commission have warned sellers about unsupported environmental claims for lab-grown diamonds, and about any wording that blurs the difference between diamond and simulant. The facts sit between the two sales pitches.
How to check a claim yourself
- Look up the report on the grading lab's own website using the report number.
- Match the inscription on the girdle to the report number, using a loupe or asking the jeweller.
- Read the wording on the product page and invoice: "laboratory-grown diamond" and "simulant" are not the same thing.
- Ask for evidence behind any environmental or ethical claim: figures, standards or certifications.
Real diamonds, honestly described
Do lab-grown diamonds pass a diamond tester?
Yes. Standard testers identify them as diamond because their thermal properties are the same.
Do lab-grown diamonds have inclusions?
Yes, many do, though often smaller or different in type from natural inclusions.
Are lab-grown diamonds worth buying?
If you want a real diamond to wear and enjoy at a lower price, yes. If you want an investment, no.
Can a lab-grown diamond be passed off as natural?
It has happened, which is why laboratories screen diamonds and why an independent report stating origin matters so much.
