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Birthstone for October; 14th Wedding Anniversary Stone
Opal is a mineral species that is transparent to opaque. The color of Opal is know to be natures Kaleidoscope, showing a strong play of rainbow colors. One of the rarest types of Opal, is the Contra-Luz Opal. Opal has a hardness of 5 to 6.5 on the Mohs scale.