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Jade test [was "naming gem materials]

Something I saw demonstrated by a gem appraiser who specialized in
jade:

Jade is such an efficient conductor of heat that you can tie a human
hair tightly around a piece of jade, play a cigarrette lighter flame
on the hair,and it will not burn.

I have seen this demonstrated and have done it myself. It works. Not
as destructive as attempting to scratch the piece with a knife.

Lee Einer
Dos Manos Jewelry
http://www.dosmanosjewelry.com

same will happen with turquoise that is natural