How to tell the difference between Moissanite and Diamond

Moissanite gemstones are such a close match to diamonds that even skilled jewelers cannot tell the two apart. Like diamonds, moissanite gemstones have inclusions and color differences. Charles & Colvard's patented Tester Model 590 (photo below) is the only recommended instrument that has been developed to distinguish moissanite from diamonds. The tool reliably and easily distinguishes colorless moissanite gemstones.

Moissanite Tester

If you have a diamond and a Moissanite stone to compare, try this test. Take your stone and hold it close to your eye. Get a penlight and shine it towards and through the stone that you are holding up to your eye (like this gentleman is doing.)

Moissanite

If it is a Moissanite, it will have the rainbow, double refractory qualities of this image.

Moissanite

If it is a diamond, it will look like this.

Moissanite