A fancy deep blue diamond and diamond ring

The square step-cut fancy deep blue diamond, weighing 1.75 carats, within a surround set with brilliant-cut diamonds of pink hue, between tapered baguette-cut diamonds, mounted in 18k white gold and platinum, ring size 5¼.. Estimate: HK$3,800,000 - 4,800,000, $490,000 - 620,000 - Unsold.

Accompanied by a certificate from GIA, stating that the 1.75 carats diamond is fancy deep blue, natural colour and VS1 clarity. Report number 11508286, dated 10th April 2001.

Bonhams. Fine Jewellery and Jadeite and Modern Wristwatches, 21 May 2009. Island Shangri-La Hong Kong Hotel, Admiralty, Hong Kong www.bonhams.com