Jewellery, Watches and Objects of Vertu to include the personal archive of Louis Osman, goldsmith and architect

A collection of four opal set rings, comprising a single stone cabochon opal ring, a five stone opal ring with single-cut diamond points between, a three stone opal ring with single-cut diamond points between, and a cabochon opal cluster ring, all mounted in 9ct yellow gold. £400-600