Pretty ring, but possibly all fake - gold plated or goldtone metal, adjustable band mounted with an oval stone which could be an opal triplet, or could be a manufactured stone. (A triplet is a slice of opal mounted between two pieces of clear resin.)
Anyway, it looks much better than the sum of its parts. Face of ring is 9 mm high by 13 mm wide. Finger fitting is approx. size M NZ or UK , or USA size 6. Can be adjusted to a smaller fit. Very good condition.

ITEM REF. No. E11517

Shipping:    NZ North Island: $10.50      NZ South Island: $12.50       Australia: $20.00     Rest of World:  $26.00