Chatoyance

the effect seen in dramatic wood grain direction changes as seen in flame figured maple.
Found on http://www.translationdirectory.com/glossaries/glossary096.htm

chatoyance

The luminous property that some gemstones have, whereby their inclusions are aligned in such a way that they reflect light in thin bands that make the stone resemble a cat or tiger's eye. This effect is usually only seen in cabochon stones
Found on http://www.saffronart.com/sitepages/jewelry/glossary.aspx

chatoyance

the property of some minerals to exhibit a wavy, luminous band with a silky lustre, reminiscent of the eye of a cat, in the centre of a cabochon-cut ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/c/60
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