Centering an oval boulder opal measuring app. 15.2 x 11.4mm, framed and flanked by four sapphires measuring app. 1.5 - 2.0mm and six diamonds (5 Single cut, 1 Round Brilliant cut) weighing app. 0.10ctw., in a Greek key design with infinity loops on shoulders, fashioned in 18k yellow & white gold. Circa 1930. Size 6.25.