A circular-cut diamond ring

Set with a circular-cut diamond, weighing approximately 24.17 carats, flanked on either side by three stepped graduated baguette-cut diamonds, mounted in platinum. Estimate $200,000 - $300,000  - Price Realized $338,500

A pear-shaped diamond ring

Set with a pear-shaped diamond, weighing approximately 10.01 carats, flanked on either side by a tapered baguette-cut diamond, mounted in platinum. Estimate $200,000 - $300,000  - Price Realized $458,500

With report 5101466552 dated 14 January 2009 from the Gemological Institute of America stating that the diamond is F color, internally flawless clarity.

A square-cut diamond ring

Set with a square-cut diamond, weighing approximately 8.65 carats, to the graduated circular-cut diamond shoulders, mounted in platinum. Estimate $120,000 - $180,000 - Price Realized $218,500

With report 17472384 dated 6 August 2008 from the Gemological Institute of America stating that the diamond is H color, VS1 clarity.

A cut-cornered square-cut diamond ring

Set with a cut-cornered square-cut diamond, weighing approximately 10.90 carats, to the graduated circular-cut diamond shoulders, mounted in platinum. Estimate $100,000 - $150,000 - Price Realized $194,500

With report 1102606085 dated 12 March 2009 from the Gemological Institute of America stating that the diamond is J color, VS1 clarity

A cut-cornered rectangular-cut diamond ring

Set with a cut-cornered rectangular-cut diamond, weighing approximately 5.22 carats, the shoulders bezel-set with three trapeze and bullet-cut diamonds, mounted in platinum. Estimate $75,000 - $100,000 - Price Realized $92,500

With report 10928614 dated 22 December 1999 from the Gemological Institute of America stating that the diamond is G color, VS2 clarity

An old mine-cut diamond bombé design ring

Of bombé design, set with an old mine-cut diamond, weighing approximately 5.05 carats, within a pavé-set diamond surround and hoop, mounted in platinum, ring size, 6¼. Estimate $60,000 - $80,000 - Price Realized $74,500

With report 11237001 dated 12 September 2000 from the Gemological Institute of America stating that the diamond is E color, SI1 clarity

A circular-cut diamond ring

Set with a circular-cut diamond, weighing approximately 7.80 carats, flanked on either side by a baguette-cut diamond, mounted in platinum. Numbered 20552. Estimate $20,000 - $30,000 - Price Realized $45,000

Christie's. New York Jewels. 11 June 2009. New York, Rockefeller Plaza www.christies.com