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Biotech / Medical : C3 ( CTHR ) Diamond in the rough? -- Ignore unavailable to you. Want to Upgrade?

To: Leslie S. Feinberg who wrote (72)	1/21/1998 4:31:00 PM
From: Gigi Snyder	Read Replies (1) \| Respond to of 226

Hi all; According to "Professor Gem" (www.jf2.com/gemstuff/askgem07.html): "Moissanite is very much like a diamond. Its 2.65 refractive index makes it similarly brilliant to diamond (at RI 2.42). Its 9.5 hardness is close to diamond, too (diamond is 10). Jewelers have long used a device called a thermal conductivity meter to separate diamonds from other materials (most refer to these as "diamond testers"). These will not work to separate moissanite from diamond as they both have high thermal conductivity factors. We're told that C3, Inc. is developing a special piece of test equipment to recognize moissanite. But all is not lost. Some relatively easy gemological tests will separate moissanite from diamond: Diamond is singly refractive, moissanite doubly (polariscope)." If a polariscope is all it takes to tell a diamond from moissanite, then I'm not sure why someone would buy a $450 tester from C3, when a polariscope can be bought for $65; made for even less! (see www.ganoksin.com/borisat/nenam/polaris.htm) Regards Gigi