An art deco emerald and diamond necklace-bracelet-earring combination, circa 1930. Photo: Bonhams.

The lavallière composed of pierced geometric links connected by a central cartouche, millegrain-set throughout with old brilliant, brilliant and single-cut diamonds, suspending two tassels of unequal length, each terminating in a large emerald drop with Mughal carving and baguette and brilliant-cut diamond surmount, mounted in platinum, diamonds approximately 8.80 carats total, detachable to form a pair of bracelets and a pair of pendent earrings, earring fittings and screwdriver supplied, necklace length 44.5cm, bracelet length 18.4cm, earring length 7.1cm, fitted case by Pohoomull Bros, Oriental Jewellers, Cairo, Egypt. Estimate £30,000 - 50,000 (€36,000 - 61,000)

The Indian firm Pohoomull was founded in 1858 by four merchant brothers. They were known as exporters of Indian and Oriental goods to the west and traded all over the Mediterranean. Their shops in Egypt, that catered to the burgeoning European tourist market, were especially lucrative. By 1911, they had twenty-two branches outside India and had expanded to China, Japan and the Philippines.

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