Does Moissanite Pass a Diamond Tester?

In most cases, Moissanite will register as a diamond when tested with a basic thermal diamond tester. This is because many diamond testers rely on thermal conductivity to distinguish between diamonds and other gemstones. Both Moissanite and Diamonds are excellent conductors of heat, and they have similar thermal conductivity properties. As a result, a basic diamond tester may give a positive reading for both Moissanite and Diamonds.

More advanced testing methods can differentiate between Moissanite and Diamond. Some gemological laboratories and jewelers use devices like a handheld spectrometer or a refractive index (RI) meter to identify moissanite accurately. These instruments measure properties such as optical dispersion and refractive index, which can differentiate between a Moissanite and Diamond.

At GlimmerJewelry.com all Moissanite jewelry is guaranteed to pass a thermal diamond tester and comes with GRA certificate that shows the properties and grading of the Moissanite including cut, color, clarity and carat size. Each GRA Moissanite stone (over 4mm in size) is also inscribed with a unique identification number to ensure authenticity.