Date: 6/20/2010 3:26:58 PM
Author:boblalux
I have just purchased via EBay a 33ct green amethyst, claiming to be unheated and from Bolivia. How can I identify this as a natural unheated minerals? I can analyse absorption spectra (hand-held diffraction).
SG is 2.65 and RI is 1.54-1.55