A sapphire and diamond ring. Photo: Christie's Images Ltd 2010

Set with a cut-cornered rectangular-cut sapphire, weighing approximately 61.27 carats, to the circular-cut diamond shoulders, mounted in platinum - Estimate $70,000 - $100,000 Price Realized $110,500

With report 2115900080 dated 6 April 2010 from the Gemological Institute of America stating that it is an expert opinion, based on a collection of observations and analytical data, that the geographic origin of this sapphire is Sri Lanka. No indications of heating

A yellow sapphire and diamond ring. Photo: Christie's Images Ltd 2010

Set with an oval-cut yellow sapphire, weighing approximately 57.64 carats, to the graduated modified baguette-cut diamond shoulders, mounted in platinum - Estimate $40,000 - $60,000 Price Realized $60,000

With report 97006411 dated 24 July 2008 from the AGTA Gemological Testing Center stating that the yellow sapphire is natural. No indications of heating

A pair of sapphire, pink sapphire and diamond ear pendants. Photo: Christie's Images Ltd 2010

Each suspending a cushion-cut sapphire, weighing approximately 12.87 and 11.59 carats, from a lozenge-shaped diamond link, to the cushion-cut pink sapphire surmount, mounted in platinum - Estimate $40,000 - $50,000 Price Realized $47,500

A sapphire and diamond ring. Photo: Christie's Images Ltd 2010

Set with a cabochon sapphire, weighing apporximately 45.63 carats, to the circular-cut diamond surround and half hoop, mounted in platinum - Estimate $30,000 - $50,000 Price Realized $43,750

With report 98009411 dated 20 August 2008 from the AGTA Gemological Testing Center stating that the data obtained during the examination of this sapphire indicates that the probable geographic origin is Sri Lanka. No indications of heating

A sapphire and diamond ring. Photo: Christie's Images Ltd 2010

Set with a cut-cornered rectangular-cut sapphire, weighing approximately 23.13 carats, flanked on either side by a half moon diamond, mounted in platinum - Estimate $20,000 - $30,000 Price Realized $25,000

Christie's. New York Jewels, 15 June 2010, New York, Rockefeller Plaza www.christies.com