Choosing between moissanite and a diamond is one of the first decisions every jewellery buyer faces. Both stones are brilliant, durable and beautiful — but they differ in important ways that affect sparkle, price and value. This guide breaks down every difference so you can choose with confidence.
What is moissanite?
Moissanite is a lab-created gemstone made of silicon carbide. First discovered in a meteor crater, today it is grown in controlled laboratory conditions, which makes it an ethical, conflict-free and affordable alternative to mined diamonds. Every Alsahra moissanite stone is D colour, VVS1 clarity and arrives with a matching GRA certificate.
Hardness and durability
On the Mohs scale of hardness, diamond scores a perfect 10 and moissanite scores 9.25 — second only to diamond among popular gemstones. In practice this means moissanite is exceptionally scratch-resistant and ideal for everyday wear, including engagement rings worn daily for a lifetime.
Brilliance and fire
This is where moissanite truly shines. Brilliance is the white light a stone returns; fire is the rainbow flashes it disperses. Moissanite has a higher refractive index (2.65–2.69 versus a diamond’s 2.42) and more than double the fire (a dispersion of 0.104 versus 0.044 for diamond). The result is a livelier, more colourful sparkle that many people prefer.
Colour and clarity
Premium moissanite like ours is graded D colour (the highest, completely colourless) and VVS1 clarity (eye-clean with virtually no inclusions). Achieving the same grades in a mined diamond costs many times more.
Price
The biggest practical difference is price. A moissanite stone can cost a fraction of a comparable diamond of the same size and grade — so you can choose a larger, higher-quality centre stone, or a more elaborate setting, for the same budget. Explore the value for yourself across our moissanite engagement rings and tennis collection.
Ethics and sustainability
Because moissanite is lab-grown, it is guaranteed conflict-free and has a far smaller environmental footprint than mined stones — an increasingly important factor for modern buyers.
Moissanite vs diamond at a glance
| Feature | Moissanite | Diamond |
|---|---|---|
| Hardness (Mohs) | 9.25 | 10 |
| Refractive index | 2.65–2.69 | 2.42 |
| Fire (dispersion) | 0.104 | 0.044 |
| Origin | Lab-created, conflict-free | Usually mined |
| Price | Affordable | Premium |
Which should you choose?
If you want maximum sparkle, ethical sourcing and outstanding value, moissanite is hard to beat. If absolute hardness or traditional resale value is your priority, a diamond may suit you better. For most buyers seeking a stunning, certified stone at a sensible price, moissanite is the smart choice.
Ready to see the difference in person? Browse our GRA-certified moissanite jewellery or start with our best-selling moissanite rings. Every Alsahra piece is backed by a lifetime warranty and free GCC shipping.
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