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

A sapphire and diamond cluster ring, 1970s, the central brilliant-cut diamond within a spaced cluster of claw set round-cut sapphires, to an abstract cluster surround of overlapping bark textured batons, mounted in 18ct yellow gold, hallmarked for London, 1972, diamond weight approximately 0.22 carats, ring size K½. £240-340