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

A late 19th century turquoise and diamond set pendant/brooch, the central pierced polished openwork panel set with cabochon turquoise (one loose), beneath a rose-cut diamond set scrolling foliate surmount, suspending cabochon turquoise and rose-cut diamond set pendant drops below, to rose-cut diamond set trifurcated bale, mounted in yellow gold, on later chain, pendant length 72mm. £1200-1500