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Moissanite 101

Straight answers about moissanite: what it is, how it compares with diamond and lab-grown diamond, what carat sizes and GRA cards mean, and how to care for it. Facts first, no hype.

What is moissanite?

Moissanite is silicon carbide (SiC), a gemstone first found in 1893 by the French chemist Henri Moissan in rock from Meteor Crater in Arizona.

Moissanite vs diamond

Moissanite and diamond look alike at a glance but they are different gems.

Moissanite vs lab-grown diamond

A lab-grown diamond is a real diamond: carbon, hardness 10, the same as a mined diamond.

Moissanite carat and size

Moissanite is sold by size.

What a GRA certificate means

A GRA card is a report that comes with most moissanite sold today.

Will moissanite pass a diamond tester?

Often, yes, on a simple tester.

Moissanite and silver care

Moissanite does not cloud or change color.