A platinum, aquamarine and diamond necklace. Photo: Christie's Images Ltd. 2011

Designed as a fringe of five graduated drop-shaped aquamarine pendants suspended from marquise and brilliant-cut diamond floral clusters to the scalloped diamond neckchain, 44.5cm long, with London hallmarks for platinum. Estimat£26,000 - £30,000  ($42,692 - $49,260)

An 18 carat gold, aquamarine and diamond necklace. Photo: Christie's Images Ltd. 2011

Designed as a series of oval-shaped aquamarine and diamond floral clusters, interspersed by similarly-set trefoil motifs to the vari-shaped aquamarine detail, mounted on a pavé-set diamond openwork leaf background, inner circumference 44.0cm, with London hallmarks for 18 carat gold .Estimate £22,000 - £25,000 ($36,124 - $41,050)

A late Victorian aquamarine and ruby necklace. Photo: Christie's Images Ltd. 2011

Designed as a series of graduated oval-shaped aquamarines, each suspending an alternate drop-shaped aquamarine and a cushion-shaped ruby to the fine link backchain and barrel clasp, mounted in gold, circa 1890, 35.5cm long, in black leather fitted case by F.H Goulding, Plymouth. Estimate £6,000 - £8,000 ($9,852 - $13,136).

Christie's . Important Jewels, 8 June 2011, London, King Street  www.christies.com