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Opalescence

Milky or pearly appearance of some common opal. The term opalescence is also used to describe a shimmering milky-white or bluish-white light caused by microscopic inclusions interacting with light. This can be observed in moonstone, common opal, and chalcedony. See girasol

Moonstone and Carved Sapphire Earrings – Example of Opalescence.