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

A turquoise and diamond ring and earclip suite, by Gübelin, each centred with an oval cabochon turquoise within a surround o claw set brilliant-cut diamonds, to wirework mounts in white precious metal, stamped ‘750’ and bearing Gübelin maker’s mark, ring size L, earclip cluster length 20mm. £1400-1600