An important coloured diamond ring. The cushion-cut fancy yellow diamond weighing 44.99 carats to the brilliant-cut diamond gallery shoulders
Estimate: $400,000-600,000 (AED1,500,000-2,200,000)

An historic emerald and diamond necklace/tiara. The Art Deco necklace designed as a series of pavé-set diamond scrolls to the detachable baguette and brilliant-cut diamond collet neckchain
Estimate: $280,000-320,000 (AED1,100,000-1,200,000)

A magnificent coloured diamond necklace. Designed as a series of graduated radiant-cut yellow diamonds, the largest diamonds weighing 20.56, 11.18 and 10.13 carats
Estimate: $1,000,000-1,500,000 (AED3,700,000-5,500,000)

Christie's Dubai : Contemporary Jewels & Watches - 1 November 2007, 6:30 pm - Godolphin Ballroom, Jumeirah - Emirates Towers Hotel, Dubai - www.christies.com