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A conch pearl, natural pearl and diamond tiara. photo Bonhams

Designed as a series of stylised loop ribbon and foliate motifs, set with brilliant and single-cut diamonds, surmounted by four natural pearls of various sizes, set at the centre with a pink conch pearl, mounted in white gold, tiara dimensions 4.5 x 8.4cm. - Sold for HK$81,600

Accompanied by five certificates from a gemmological lab, stating that the saltwater pearls are natural and the conch pearl is a calcareous concreation. Report number US 53111512P, US 53111503P, US 53111505P, US 53111507P, and US53111509P, dated 15th October 2009.

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A fine conch pearl and diamond necklace. photo Bonhams

Set with pink, light pink, and orange conch pearls, alternating with briolette-cut diamonds, to a marquise and old brilliant-cut diamond clasp, mounted in platinum, conch pearls approximately 66.40 carats total, diamonds approximately 16.00 carats total, necklace length 44.3cm.- Sold for HK$624,000

Accompanied by a report from GIA, stating that the fifteen saltwater conch pearls are natural, with no indications of treatment. Report number 2125143472, dated 26th May 2010.

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A fine pair of conch pearl and diamond earring. photo Bonhams

Each set with an oval pink conch pearl, measuring approximately 11.7 x 9.1 mm or 11.4 x 8.7mm, within a pear and brilliant-cut diamond surround, mounted in platinum, earring length 2.1cm. Sold for HK$132,000

Accompanied by a report from GIA, stating that the saltwater conch pearls are natural, with no indications of treatment. Report number 2125496318, dated 13th August 2010.

Bonhams. Bloch Collection; Wine and Whisky; Chinese Ceramics, Works of Art & Paintings; Jewellery, Jadeite and Wristwatches and Writing Instruments, 23 Nov 2010 to 24 Nov 2010, Hong Kong www.bonhams.com