Gem Phenomena
In gemology, a phenomenon is an unusual optical effect that is displayed by a gem. Play-of-color, labradorescence, iridescence, adularescence, chatoyancy, asterism, aventurescence, lustre and color change are all phenomena of this type.
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Famous quotes containing the words gem and/or phenomena:
“Love may be the fairest gem which Society has filched from Nature; but what is motherhood save Nature in her most gladsome mood? A smile has dried my tears.”
—Honoré De Balzac (1799–1850)
“The manifestation of poetry in external life is formal perfection. True sentiment grows within, and art must represent internal phenomena externally.”
—Franz Grillparzer (1791–1872)