Feature
Gems & Gemology, Fall 1987, Vol. 23, No. 3

Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color

Peer Reviewed Article
Karl Schmetzer and Ulrich Henn
The products of Kyocera Corp. that show play-of-color were investigated to determine if the materials are truly synthetic opal or rather are opal simulants. The authors propose that, because these materials contain no water, they do not match the composition of natural opals and, thus, should be designated opal simulants. The gemological properties of the samples examined are also provided, including those by which the Inamori material can be separated from natural opal.

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