Moissanite vs diamond: the real differences, explained simply

What moissanite is

Moissanite is silicon carbide, a mineral first found in tiny amounts in a meteor crater. The moissanite used in jewellery today is created in laboratories, which makes it consistent and far more affordable than a mined diamond of the same size.

Hardness

Diamond is the hardest natural material at 10 on the Mohs scale. Moissanite is about 9.25, harder than sapphire and ruby, which is why it is durable enough for jewellery you wear every day.

Sparkle

Moissanite has a higher refractive index than diamond (about 2.65 against 2.42) and roughly double the dispersion, the effect that splits light into colour. In practice, moissanite shows more rainbow flashes, especially in sunlight, while diamond shows more white sparkle.

Colour and look

Most modern moissanite is near-colourless. In very large stones or certain lights it can show a faint warm or grey tint. To most people, at everyday sizes, a moissanite pendant reads simply as a bright, sparkling stone.

Price

This is the biggest difference. A one-carat-look moissanite costs a small fraction of a similar diamond, which is why it is popular for everyday pieces and gifts.

How to tell them apart

A jeweller can tell with a moissanite tester or under magnification (moissanite shows double refraction, so facet edges can look doubled). By eye, the colourful fire is the easiest clue.

Caring for a moissanite necklace

Moissanite itself is very durable; the setting and chain need more care. Clean it with warm water, a drop of mild soap and a soft brush, rinse and dry well. Keep it away from chlorine and store it on its own.

Lab-created doesn’t mean fake

Moissanite, like lab-grown diamonds, is a real crystal grown under controlled conditions. It isn’t glass or cubic zirconia: it has its own chemistry and optical properties. Being lab-created also means it doesn’t involve mining.

Moissanite vs cubic zirconia

Cubic zirconia (CZ) is another popular, affordable stone, but it is softer (about 8–8.5 on the Mohs scale) and can become scratched and cloudy-looking over years of wear. Moissanite is harder and keeps its polish and brilliance better, which is why it costs more than CZ but far less than diamond.

Choosing a moissanite pendant

Look at the setting as well as the stone: a halo of small stones around the centre makes the pendant look larger and adds sparkle, while a simple solitaire looks cleaner. Check the chain length, around 16–18 in suits most necklines, and the metal, which is listed on each product page.

Is moissanite a good gift?

Moissanite gives the look of a large, bright stone at a price that makes sense for birthdays, anniversaries and holidays. It is durable enough to be worn every day, which matters more for a gift than a stone that stays in a drawer.

What “1 carat” means

Carat is a measure of weight, not size. Because moissanite is lighter than diamond, moissanite sellers often describe stones by their “diamond-equivalent” size, so a “1 carat” moissanite looks about as large as a 1 carat diamond, roughly 6.5 mm across for a round stone.

Caring for moissanite

Moissanite is very hard, so the stone itself is easy to look after; the setting and chain need more care. Clean it with warm water, a drop of mild soap and a soft brush, rinse, and dry with a lint-free cloth. Oils from skin and lotion are the main reason any stone looks dull, so a quick clean every couple of weeks keeps it bright. Check the prongs now and then to make sure the stone is secure.

Pieces to start with

Heart Moissanite Pendant Necklace ($48.00, $40.80 in the sale): a moissanite piece with that bright, colourful sparkle. It has a moissanite stone and a heart motif. Material: Metal alloy.

1CT Moissanite Pendant Necklace ($64.74, $55.03 in the sale): a moissanite piece with that bright, colourful sparkle. It has a moissanite stone. Material: 925 sterling silver.

Buying from Liravelle

Every product page lists what a piece is made of, what arrives and the delivery dates before you order, and the confirmation email repeats them. Free US delivery over $50. 30-day returns. Tracked delivery.