Fiery 18k Geometric Opal Ring

This unique ring has an interesting geometric shape and a gorgeous rectangular opal with brilliant colors that change in the sunlight from blue to orange to green. 

Crafted in 18k, it has a hallmark/designer stamp I have not been able to identify on the outside of the setting, possibly a designer piece. Size 7.5 (sizable), 4.3 grams.

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