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Opal and tourmaline are the two birthstones for October. Both of these gemstones are known for their endless color combinations and are believed ...

Opal, labradorite and moonstone form in microscopic layers of material that are successively stacked upon each other, giving rise to phenomena based on these unique structures. 

Purple opals exist but are not known to display play-of-color like these specimens do.

Opal evaluation should be done under controlled lighting on a dark background.