World Class Untreated Sapphires
SRI LANKA - MADAGASCAR - USA
The following article by Danner is a great introduction to the necessary steps for identifying Natural Unheated Sapphires in general. This article has provided the methods on a Yellowish Orange Sapphire which could be used on other colors as well with respect to the FTIR spectra of each color.
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Written By: J.M. Duroc Danner
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