Three opal set rings, the first with round cluster of four oval cabochon opals spaced by small round-cut garnets, mounted in 9ct gold, shank hallmarked; the second with a square flat cabochon opal between shoulders set with trios of old brilliant-cut diamonds, all millegrained collet set, shank stamped ‘18ct&plat’; the third ring claw set with a triangular black opal doublet, within a surround of rose-cut diamonds, mounted in white precious metal. £500-700