18K yellow gold ring featuring an oval opal with mostly green and blue play-of-color, measuring 23 x 12 mm and weighing approx. 5.70 cts, bezel set, step shoulders, hammered finish with high polish, sz 6, 16.2 gram

Additional comments added on 5/3/2022: We do not believe it is a doublet because we can see the play -of-color through the back. However, we cannot confirm because we cannot take the ring apart Additional comments added on 4/25/2022: It is a boulder opal, you can see matrix on back Unless stated in a laboratory report, gemstone and diamond color, clarity, and carat weight are approximate because stones are mounted at the time of evaluation.