Physical Phenomena - Gem Phenomena

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.
    HonorĂ© De Balzac (1799–1850)

    It is impossible to dissociate language from science or science from language, because every natural science always involves three things: the sequence of phenomena on which the science is based; the abstract concepts which call these phenomena to mind; and the words in which the concepts are expressed. To call forth a concept, a word is needed; to portray a phenomenon, a concept is needed. All three mirror one and the same reality.
    Antoine Lavoisier (1743–1794)