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<p>[QUOTE=&quot;Coin Talk User, post: 2965902, member: 90165&quot;]Diamond testers were built to separate CZs from diamonds, since they look nearly the same. CZ has very low thermal conductivity while diamond has very high conductivity.&nbsp; Sapphire and moissanite have high conductivity too.&nbsp; Occasionally sapphire of any color may test as diamond [topaz too] but their optical properties are much lower than diamond so the tester would know the difference and disregard. Find a trained gemologist if you want to be sure of a stone&#039;s identity. Sometimes jewelers don&#039;t know.[/QUOTE]</p><p><br /></p>

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