Photo of a moissanite next to a diamond

Moissanite vs Diamond

Moissanites and diamonds look very similar to the naked eye, but when you look a little closer, you will find that they are quite different from each other in a few ways.


Diamonds are made from pure carbon, making it the hardest mineral substance on earth, measuring 10/10 on Moh’s hardness scale. Moissanites might look like diamonds, but they are not made from carbon at all. They are made from silicon carbide and are a 9.5 on the Moh scale for hardness, which is still incredibly durable.


Moissanite’s refractive index is 2.65 - 2.69 whereas diamonds’ is 2.417, meaning moissanites shine with fiery, rainbow flashes that diamonds cannot achieve.


Moissanites and diamonds are both extremely durable. Both are very hard and scratch resistant and will not fade or lose colour. Many other gems and stones such as cubic zirconias are not as hard or more brittle and will get micro-abrasions on their surface which can make them look dull. Moissanites do not dull and retain their luster forever.

Read more: Is moissanite the same as cubic zirconia? >>


Thanks to moissanite production methods, their prices are not determined by scarcity, conglomerates or high mining costs. This means that moissanites can cost a fraction of the price of diamonds. Moissanite gemstones can cost between 50 and 90% less than a diamond of equivalent size, cut, colour and clarity.


To the naked eye, moissanites and diamonds are indistinguishable. It’s only when direct and bright light shines on moissanites, that they light up and shine with their trademark brilliance which puts diamonds and other white gemstones to shame.