A conch pearl and diamond necklace. Photo Bonhams

The necklace with a semi-articulated scrolling openwork frontispiece, set throughout with round brilliant and marquise-cut diamonds, interspersed with seventeen oval-shaped conch pearls, to an articulated undulating diamond-set link backchain, mounted in platinum, the diamonds estimated to weigh approximately 14.00 carats in total, necklace length 47.0cm. Estimate: HK$687,000 - 780,000, US$ 88,000 - 100,000

Accompanied by a certificate from GIA, stating that the seventeen pink saltwater conch pearls are natural and show no indication of treatment. Report number 1132473783, dated 26th May 2011

A conch pearl and diamond necklace. Photo Bonhams

A pair of conch pearl and diamond earrings. Photo Bonhams

The articulated earrings of chandelier design, the round brilliant-cut diamond surmount suspending a line of graduated fleur-de-lys motif links set with round brilliant-cut diamonds, each terminating in a conch pearl drop, measuring approximately 13.4 x 8.3mm and 12.4 x 7.8mm, mounted n 18k white gold, the conch pearls estimated to weigh approximately 14.00 carats in total, the diamonds estimated to weigh approximately 1.00 carats in total, earring length 5.5cm. Estimate: HK$98,000 - 140,000, US$ 13,000 - 18,000

Accompanied by a certificate from GIA, stating that the two saltwater light-pink conch pearls are natural and show no indications of treatment  Report number 2135723522, dated 17th August 2011

A conch pearl and diamond ring. Photo Bonhams

Set with an oval conch pearl, measuring approximately 12.0 x 7.6mm, flanked by a pair of trillion-cut diamonds, to a plain hoop, mounted in platinum, the conch pearl estimated to weigh approximately 6.30 carats, the diamonds estimated to weigh approximately 1.60 carats in total, ring size 6½. Estimate: HK$47,000 - 67,000, US$ 6,000 - 8,600

Accompanied by a certificate from GIA, stating that the saltwater pink conch pearl is natural and shows no indications of treatment. Report number 2135274610, dated 6th April 2011

A pair of conch pearl and diamond earrings. Photo Bonhams

Each composed of an oval conch pearl, both measuring approximately 8.9 x 7.0mm, to a partially diamond-set frame and surmount with scroll detailing, mounted in platinum, the diamonds estimated to weigh approximately 0.60 carats in total, earring length 3.0cm; Estimate: HK$43,000 - 63,000, US$ 5,500 - 8,100

Bonhams. Fine Jewellery & Jadeite, 27 Nov 2011. Hong Kong www.bonhams.com