Joined: Tue Apr 05, 2016 7:58 pm Posts: 1424 Location: San Marcos, CA
Looks like opal and possibly rhodolite garnet. Stamped 18k. Any other markings in the ring shank? Really you need to take it to qualified person for id and evaluations.
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
More interesting to me is the ring itself. Stamped IS★ I couldn't find this maker's mark in my reference guides. Is there a quality stamp, or have you tested the fineness of the metal? The basket style gallery is unusually high and the components seem fabricated, as one can see remnants of solder in the profile.
I'd say, it looks mid-century, probably the 60's. Australian opal with pink sapphires, probably sold as ruby.
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