https://www.etsy.com/au/listing/482506923/genuine-australian-black-opal-two

Black opal is one of the many fascinating varieties of opal available today and it also happens to be one of the most popular varieties. In 2008,

Black opal is by far the most valuable and appreciated of all opal varieties.

RING SIZE : US S 7; Australian & British O
HEAD SIZE : 24.0 X 12.0 MM
WEIGHT CT : 35.30 g (total weight)
METAL : 14k WHITE GOLD and 925 Sterling Silver (core metal)

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