A 11.45 carats cushion-shaped paraiba tourmaline and diamond ring

The cushion-shaped paraiba tourmaline, weighing 11.45 carats, within a brilliant-cut diamond surround, to a raised diamond gallery designed as stylised infinity signs, embellished at the corners with pear-shaped diamonds, to the partially set diamond shoulders, mounted in 18k white gold, ring size 5¾. - Estimate: HK$580,000 - 780,000, $75,000 - 100,000 - Unsold.

Footnote: Accompanied by a report from Gübelin Gem Lab, stating the paraiba elbaite tourmaline is natural and is blue colour. Report number 0801003, dated 7th January 2008.

Bonhams. Fine Jewellery and Jadeite, 4 Dec 2008. Hong Kong. Copyright © 2002-2008 Bonhams 1793 Ltd., Images and Text All Rights Reserved. www.bonhams.com