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

A sapphire, emerald and diamond set ‘Trombino’-style dress ring, the cushion-cut Sri Lankan sapphire collet set within domed mount pavé set throughout with brilliant-cut diamonds, the shoulders channel set with lines of graduating rectangular-cut emeralds, to a broad polished shank, two colour precious metal mounted, accompanied by a GCS report, ring size 0 (leading edge). £3800-5000

The Gemmological Certification Services report, number 78132-82, dated, 08.12.2017, confirms the sapphire weighs approximately 4.6 carats, is of Sri Lankan (Ceylon) origin, and has no indications of heating.