Moissanite vs Lab Diamond Grillz – Which Is Right for You?
When it comes to iced-out grillz, two stones dominate the conversation: moissanite and lab-grown diamonds. Both are stunning, both are ethical alternatives to mined diamonds, and both are used in Ice Jeweller's custom grillz — but they're not the same stone, and the differences matter.
This guide covers everything you need to know to make the right choice.
What Are They?
Lab-grown diamonds are real diamonds — chemically, physically, and optically identical to mined diamonds. They're created in a controlled environment using the same process that forms diamonds underground (either High Pressure High Temperature, or Chemical Vapour Deposition). The only difference from a mined diamond is the origin.
Moissanite is a different gemstone entirely. Originally discovered in a meteorite crater in 1893 by scientist Henri Moissan, natural moissanite is incredibly rare. Almost all moissanite used in jewellery today is lab-created silicon carbide (SiC). It looks similar to a diamond but has distinct optical properties.
Side-by-Side Comparison
| Moissanite | Lab-Grown Diamond | |
|---|---|---|
| Hardness (Mohs) | 9.25 | 10 |
| Refractive Index | 2.65–2.69 | 2.42 |
| Fire (dispersion) | 0.104 — very high | 0.044 |
| Brilliance | Extremely high | High |
| Sparkle style | Rainbow, colourful flashes | White light, crisp sparkle |
| Price (per carat) | ££ | £££ |
| Composition | Silicon carbide (SiC) | Carbon (same as diamond) |
| Is it a diamond? | No | Yes |
Brilliance and Sparkle
This is where the two stones genuinely differ — and it's worth understanding before you choose.
Moissanite has a refractive index of 2.65–2.69, compared to a diamond's 2.42. It also has a dispersion value of 0.104 — roughly 2.4 times higher than a diamond's 0.044. In plain terms: moissanite produces more rainbow-coloured flashes (called "fire") than a diamond. Under certain lighting, this creates a vivid, colourful sparkle that many people find even more eye-catching than a diamond.
Lab diamonds produce a crisper, whiter sparkle. The light return is cleaner — less rainbow, more concentrated brilliance. To many eyes, this reads as more "classic" and natural.
For grillz specifically, moissanite's extra fire works in its favour — under nightlife lighting, it's intensely flashy. Lab diamonds tend to look cleaner and more understated in comparison.
Hardness and Durability
Lab-grown diamonds score a 10 on the Mohs scale — the maximum possible rating. Nothing scratches a diamond except another diamond.
Moissanite scores 9.25 — still exceptionally hard, and more than sufficient for jewellery worn regularly. For context, sapphire scores 9.0. The difference between 9.25 and 10 is unlikely to matter in everyday grillz wear.
Both stones will outlast you with proper care. The setting that holds them is typically the more vulnerable element.
Can You Tell the Difference?
To the naked eye: rarely. Most people cannot distinguish high-quality moissanite from a lab diamond without a loupe or testing equipment. A jeweller with a diamond tester can — moissanite has a double refractive property that causes a "doubling" effect under magnification, which diamonds don't have.
In grillz, where stones are small and set closely together, the visual difference between the two is minimal in normal viewing conditions.
Price Difference
This is the most practical consideration for most buyers.
Moissanite grillz typically cost 70–80% less than equivalent lab diamond grillz. At Ice Jeweller:
- Moissanite grillz — from £191
- Lab diamond grillz — from £239
The gap widens significantly with larger, more complex pieces. A fully iced-out bustdown in moissanite could cost £300–£400 less than the same piece in lab diamonds.
Are Lab Diamonds "Real" Diamonds?
Yes — completely. Lab-grown diamonds have the same chemical composition (carbon), the same crystal structure, the same hardness, and the same optical properties as mined diamonds. They're graded using the same 4Cs (cut, colour, clarity, carat) by the same gemological laboratories.
The only thing that distinguishes them from a mined diamond is that they were grown in a laboratory rather than extracted from the earth. This also makes them a more ethical and environmentally responsible choice.
Which Should You Choose for Grillz?
Choose Moissanite Grillz if:
- You want maximum visual impact for less spend
- You love colourful, rainbow-fire sparkle
- You're ordering a large or fully iced-out set where cost adds up quickly
- You want the closest look to diamonds at a lower price point
Choose Lab Diamond Grillz if:
- You want actual diamonds — full stop
- You prefer a cleaner, whiter sparkle over rainbow fire
- You're investing in a premium piece and want the prestige of diamonds
- You plan to keep them long-term as a jewellery investment
What About VVS?
You'll often see grillz marketed as "VVS diamonds" or "VVS moissanite." VVS stands for Very Very Slightly Included — a clarity grade that means the stone has minute inclusions that are extremely difficult to see even under 10x magnification.
VVS is the second-highest clarity grade in gemology (after Flawless and Internally Flawless). In grillz, VVS stones are the industry standard for premium pieces — they deliver a clean, brilliant appearance with no visible imperfections.
At Ice Jeweller, all diamond and moissanite grillz use VVS-grade stones, hand-set by our craftsmen.
The Bottom Line
Moissanite and lab diamonds are both excellent choices for grillz — they're durable, brilliant, and far more ethical than mined stones. Moissanite wins on price and fire. Lab diamonds win on prestige and that classic crisp sparkle.
Neither is the wrong answer. It comes down to your budget and the look you're going for.
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