Published on 05-14-2015 01:37 PM
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During the course of a 2007 request for a damage evaluation on the diamond see at left, I was asked to ascertain whether or not the fancy color of this diamond was natural or due to some type of treatment. The diamond was a fancy brownish pink and had a damage event marked by a fracture that extended to the table from one corner, as seen in the image at left.
Upon initial inspection there was no indication of any type of treatment to the diamond, and issues like HPHT and radiation were ruled out as the color and fluorescence was unlike any HPHT Type I diamond, and irradiation would have presented itself with a Raman scan. For all practical purposes, the fancy color of this diamond appeared to be natural. However, the dealer who submitted the stone for damage evaluation had information that this diamond had, indeed, been subjected to some kind of coating treatment to artificially create the fancy color, but could not verify this themselves. As a result I continued to inspect the stone for known methods of identifying some type of coating treatment.