A conch pearl, pink sapphire and diamond necklace. Photo: Bonhams

Comprising twenty-one vari-shaped conch pearls measuring 5.7 x 6.4mm to 10.8 x 14.1mm, spaced by seed pearls, pink sapphire and diamond rondelles, to a clasp set with an oval-cut diamond surrounded by brilliant-cut diamonds, diamonds approximately 4.00 carats total, length 40.5cm. Estimate HK$ 560,000 - 620,000 (€53,000 - 58,000)

Bonhams. FINE JEWELLERY AND JADEITE, Hong Kong, Admiralty, 21 May 2014 - http://www.bonhams.com/