Examples of the major special optical effects to be found in precious stones.
Images 1-8 of 8
 Asterism in Corundum |  Chatoyancy in Quartz |  Fire in Diamond |  Fluorescence in Fluorite |
 Iridescence in Seashell |  Labradorescence in Labradorite |  Opalescence in Opal |  Schiller in Opal |
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