An important colored diamond. Photo: Christie's Images Ltd 2010

Set with a cut-cornered modified square-cut fancy intense orangy pink diamond, weighing approximately 10.19 carats, flanked on either side by a shield-shaped diamond, to the circular-cut diamond prongs, gallery and hoop, mounted in platinum and 18k rose gold, ring size 6 - Estimate $1,000,000 - $1,500,000

With report 14887695 dated 21 March 2006 from the Gemological Institute of America stating that the diamond is fancy intense orangy pink, natural color, VS1 clarity

A fine colored diamond. Photo: Christie's Images Ltd 2010

Set with a modified pear-shaped light pink diamond, weighing approximately 12.50 carats, within a circular-cut pink diamond surround, mounted in 18k rose gold - Estimate $800,000 - $1,200,000

With report 2115724753 dated 22 February 2010 from the Gemological Institute of America stating that the diamond is light pink, natural color, internally flawless clarity

A colored diamond. Photo: Christie's Images Ltd 2010

Set with a modified hexagonal fancy intense pink diamond, weighing approximately 3.01 carats, to the pavé-set pink diamond bifurcated knife-edge shoulders and hoop, mounted in 18k rose gold, ring size 6 - Estimate $550,000 - $700,000

With report 1102557652 dated 11 February 2009 from the Gemological Institute of America stating that the diamond is fancy intense pink, natural color, SI1 clarity

Suspending a modified shield-cut faint pink diamond, weighing approximately 0.88 carats, within a circular-cut diamond surround, from a collet-set diamond link, to the oval-cut light pink diamond, weighing approximately 0.42 carats, within a circular-cur diamond surround and collet-set diamond link, to the oval-cut link pink diamond surmount, weighing approximately 0.56 carats, within a diamond surround, suspended from a fine link white gold chain, mounted in platinum and rose gold, 16 ins. Estimate $10,000 - $15,000

With report 1102513179 dated 9 January 2009 from the Gemological Institute of America stating that the diamond, weighing approximately 0.88 carats, is faint pink, natural color

With report 2105406011 dated 20 November 2008 from the Gemological Institute of America stating that the diamond, weighing approximately 0.56 carats, is light pink, natural color

With report 16263782 dated 20 September 2007 from the Gemological Institute of America stating that the diamond, weighing approximately 0.42 carats, is light pink, natural color, SI2 clarity

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