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Winter 1990, Volume 26, Issue 4 (sold out)

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Diagnostic Features and Heat Treatment of Kashmir Sapphires
Rolf Schwieger


The locality origin of natural-color blue sapphires from Kashmir can, in many cases, be positively identified. However, the field of origin determination is a very complex one—especially with the now-common practice of heat treatment. Today, only by combining different gemological tests with years of practical experience can a conclusive determination of the origin of a sapphire be made. For all practical purposes, examination of inclusions in conjunction with optical spectrophotometry remain the most important tests.

Appears on pages 267-280

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