30-second answer
Lab-grown diamonds are diamonds, but they are not natural diamonds.
Like natural diamonds, they are primarily made of carbon and have the crystal structure, hardness, and optical properties of diamond; however, they are not formed deep within the Earth over a long geological process, but grown in a laboratory using technologies such as high pressure high temperature or chemical vapour deposition.
So the most accurate way to say it is:Lab-grown diamonds are genuine diamonds, but their source is not a natural mine.
Celeste Jewellery does not recommend calling lab-grown diamonds simply "fake diamonds", nor calling them "real diamonds" without stating the source. The responsible wording is: laboratory-grown diamond, or laboratory-grown diamond.
What is the difference between lab-grown diamonds, natural diamonds, moissanite, and simulants?
| Type | Is it a diamond? | Source | Value logic |
|---|---|---|---|
| Natural diamonds | Yes | Naturally formed deep within the Earth and brought to market through mining | Rarity, quality, certification, market liquidity |
| Lab-grown diamonds | Yes | Grown in a laboratory, commonly using HPHT and CVD technologies | Visual effect, specifications, production cost, market supply |
| Moissanite | No | A silicon carbide material, naturally extremely rare, but commercially usually synthetic | Decorative appeal, accessible price, different fire characteristics |
| Cubic zirconia / glass simulants | No | Man-made imitation materials | Decorative appeal, far lower value system than diamonds |
When judging a stone, the first step is not to ask how much it sparkles, but to confirm exactly what it is.
Why should lab-grown diamonds not be called "fake diamonds"?
Because lab-grown diamonds are not glass, not cubic zirconia, and not moissanite. They are diamonds grown in a laboratory.
But they also cannot be sold vaguely as if they were natural diamonds. The FTC's core requirement for jewellery advertising and descriptions is accuracy, clarity, and no deception. For laboratory-grown or simulant stones, descriptions must not make consumers think they are mined natural diamonds.
Therefore, the safest wording in brand content is:
- Laboratory-grown diamonds
- Lab-grown diamonds
- laboratory-grown diamond
- laboratory-created diamond
Do not use misleading wording:
- Only write "diamond" without stating that it is lab-grown.
- Call a lab-grown diamond "the same as a natural diamond" without disclosing the source.
- Package moissanite, zircon, or simulants as "diamond alternatives" without stating what they are.
How are lab-grown diamonds formed?
There are two main mainstream methods for growing lab-grown diamonds.
HPHT high pressure high temperature method
This simulates the high-temperature, high-pressure environment required for natural diamond formation, allowing carbon atoms to grow on a seed crystal.
CVD chemical vapour deposition method
Within a vacuum chamber, carbon-containing gas is decomposed so that carbon atoms deposit layer by layer onto a diamond seed.
Both methods can grow gem-quality diamonds, but differences in production process, post-treatment, cutting, and sorting standards will affect the final quality.
Do lab-grown diamonds need certification?
Yes, especially for engagement rings and high-value bespoke jewellery.
The point of certification is not to prove "whether it looks like a diamond", but to clearly state:
- It is a laboratory-grown diamond.
- Its weight, colour, clarity, cut, or grading status.
- Whether it has an inscription on the girdle or a report number.
- Whether it has undergone post-treatment.
- It is not a natural diamond, nor is it moissanite or a simulant.
GIAAfter the 2025 update to laboratory-grown diamond services, some colourless to near-colourless lab-grown diamonds use quality grading terms such as Premium / Standard, and the girdle is required to bear Laboratory-Grown and the grading number. Report formats may vary by institution, so buyers should follow the official report type.
Who is suited to lab-grown diamonds
Lab-grown diamonds suit these users:
- Those who want a larger carat weight within the same budget.
- Those who care more about the wearing effect than natural rarity.
- Those who want the visual presence of a diamond ring to be stronger.
- Those who are comfortable with a laboratory-grown origin.
- Those who see a ring as an expression of feeling and aesthetics, rather than an asset allocation.
Who is not suited to lab-grown diamonds
Lab-grown diamonds are not suitable for these users:
- Those who place very high value on natural rarity.
- Those who want jewellery with stronger heirloom significance.
- Those with high expectations for future resale value.
- Those whose family or partner clearly prefers natural diamonds.
- Those whose purpose is close to collecting or high-end asset allocation.
Celeste Bespoke recommendation
Celeste's position on lab-grown diamonds is: they may be chosen, but transparency is essential.
If a client wants a larger, brighter, more visually striking engagement ring within the same budget, a lab-grown diamond is a reasonable choice. If they value naturally formed rarity, the traditional meaning of a wedding ring, and long-term inheritance, a natural diamond better fits the need.
The truly elegant approach is not to belittle either side, but to return the choice to the client.
Celeste recommends confirming three questions at every bespoke consultation:
- Do you care more about visual effect or natural rarity?
- Is this ring mainly for an engagement, or for future inheritance?
- Do you accept that the laboratory report and delivery documents will clearly state "laboratory-grown diamond"?
FAQ
Q1: Is a laboratory-grown diamond a fake diamond?
No. A laboratory-grown diamond is a diamond, but not a natural diamond.
Q2: Are laboratory-grown diamonds the same as moissanite?
No. Moissanite is not a diamond; a laboratory-grown diamond is a diamond grown in a laboratory.
Q3: Can a laboratory-grown diamond be used for an engagement ring?
Yes, provided both parties fully understand and accept its origin and value proposition.
Q4: Do you need to make this clear to the other person?
Yes, it is best to be clear. An engagement ring is a piece of jewellery with high emotional value, and transparency matters more than a “surprise reveal”.