Koroit Boulder Opal Freeform Oval Rub blue orange yellow green fire 3.5 carats

This is a freeform oval Koroit boulder opal cabochon from Gene McDevitt’s mine in Australia ~ 7 carats. Measures at: 15 mm x 11 mm x 2 mm Blue green orange yellow fire with a flat edge and a divot on the back. Good little piece to back or have.

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