Moissanite Tester

Electrical conductivity test — the only reliable way to separate moissanite from diamond

Typical price$ 40 - 200

PortabilityHighly portable

Field notePocket-sized, battery powered

How to use it

Allow the tester to power on and calibrate according to the manufacturer's instructions
Ensure the stone is clean and at room temperature
Touch the probe tip lightly to a flat, polished facet of the stone
Read the display: moissanite triggers a positive electrical conductivity signal; diamond does not
Always use this tester after a thermal probe confirms high thermal conductivity

Reading tips

Moissanite conducts electricity weakly; diamond does not — this is the key physical difference exploited by these testers
Never rely on a thermal probe alone: moissanite and diamond have nearly identical thermal conductivity
The standard workflow is thermal probe first (eliminates CZ, glass, sapphire), then moissanite tester (separates moissanite from diamond)
Some very small stones or pavilion facets may give weak signals; test from the table facet for best contact
Combined thermal + moissanite testers exist as single units and are convenient for buying situations