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

An Art Deco emerald and diamond set panel ring, the oval mixed-cut emerald collet mounted within a surround of graduated old brilliant-cut diamonds, millegrain and collet set, between shaped panel shoulders of old brilliant-cut diamonds and baguette-cut sapphires, mounted in white precious metal, cluster panel dimensions 25mm x 19mm, ring size M½. £2800-3500