Moissanite vs Diamond: An Honest Buyer's Guide

The short answer

Moissanite gives you more visible sparkle than a diamond, at roughly a tenth of the price, and it's hard enough to wear every day. A diamond is rarer, holds resale value, and is marginally harder. For almost everyone shopping in this price range, moissanite is the sensible choice — the "downsides" are things you'll never notice in normal wear.

Sparkle: moissanite actually wins

Brilliance comes down to refractive index — how much a stone bends and returns light. Diamond sits at about 2.42; moissanite is higher, around 2.65. In practice that means moissanite throws more fire (those flashes of rainbow colour). Some people love the extra disco-ball effect; purists find it a touch too much in large stones. Either way, moissanite is not the "lesser sparkle" option — if anything it out-sparkles diamond.

Hardness and everyday wear

On the Mohs scale, diamond is 10 (the hardest natural material) and moissanite is about 9.25 — harder than any gemstone except diamond, and well above sapphire. For a necklace or pendant, which take far less knocking than a ring, this difference is academic. Moissanite will not scratch or cloud with normal wear.

Price: the real difference

This is where it matters. A one-carat diamond of decent quality runs into the thousands; an equivalent moissanite is typically a small fraction of that. That's the whole appeal — you get the size and sparkle of a statement stone for a fashion-piece price. It also means you can wear it without worrying about loss or theft the way you would with a diamond.

How to tell them apart

To the naked eye, a good moissanite is very hard to distinguish from a diamond. Under close inspection moissanite shows more colourful fire and, in larger stones, a subtle "doubling" of facet edges when viewed through the crown. Standard diamond testers that only measure thermal conductivity can misread moissanite as diamond — which tells you how close they are optically.

So which should you buy?

Buy a diamond if you specifically want a natural diamond for sentimental or resale reasons and have the budget. Buy moissanite if you want maximum sparkle and size for your money in a piece you'll actually wear without anxiety — which describes most jewellery shopping. In this catalogue, moissanite is where the best value-to-impact ratio lives.