Lively play of colour Australian opal oval cabochons 6mm x 4.5mm, 5mm x 4mm with old mine cut diamonds in between (0.20cts total) head size 15.5mm x 6.5mm. Ribbed details to shoulders and gallery. Hallmarked Birmingham 18ct yellow gold date 1900. Maker's mark A.E.C. Serial numbers 2624. Mint condition. Currently finger size P 1/2 (U.S 8)