A conch pearl and diamond brooch and earring suite, circa 1900. Photo: Bonhams.

The brooch designed as two opposing highly stylised flower heads set throughout with old brilliant-cut diamonds, each issuing a rose-cut diamond and conch pearl bud, connected by a single cushion-shaped diamond in a lozenge-shaped collet, accompanied by a pair of old brilliant-cut diamond and conch pearl cluster earrings, mounted in silver and gold, diamonds approximately 9.50 carats total, earrings later converted, brooch diameter 5.5cm, earring length 1.8cm, cased by Boucheron, 180 New Bond Street, London, W1, St. Petersburg, Persp, Newsky 26, New York, Fifth Avenue, 705, 26 Place Vendôme, Paris. Estimate £4,000 - 6,000 (€4,900 - 7,300)

Bonhams. FINE JEWELLERY. London, New Bond Street, 30 Apr 2014 - www.bonhams.com