An oval-shaped sapphire and diamond ring, mounted by Mauboussin

The oval-shaped sapphire to the pavé-set diamond interwoven surround and hoop, ring size K; Signed Monture Mauboussin, No. A2073. Estimate £20,000 - £30,000 ($32,320 - $48,480) - Price Realized £22,500 ($36,360)

Accompanied by report No. 53650 dated 3 April 2009 from the Swiss Gemmological Institute (SSEF) stating that the sapphire weighing approximately 12 carats is of Burmese origin with no indications of heating

Christie's. Jewellery. 10 June 2009. London, King Street www.christies.com