A colored diamond ring

Set with a cut-cornered modified rectangular-cut fancy intense blue diamond, weighing approximately 7.02 carats, to the circular-cut pink diamond gallery and bifurcated shoulders, with an 18k rose gold hoop - Estimate $2,000,000 - $3,000,000

With report 17257666 dated 9 June 2008 from the Gemological Institute of America stating that the diamond is fancy intense blue, natural color, VS1 clarity

A colored diamond and emerald ring

Set with an oval-cut fancy vivid yellow-orange diamond, weighing approximately 7.32 carats, flanked on either side by a half-moon emerald, mounted in 18k gold - Estimate $600,000 - $800,000

With report 2105531160 dated 30 January 2009 from the Gemological Institute of America stating that the diamond is fancy vivid yellow-orange, natural color

An impressive colored diamond ring

Set with a modified cushion-cut fancy intense yellow diamond, weighing approximately 40.92 carats, to the circular-cut yellow diamond prongs, gallery and sculpted "figure-8" hoop, mounted in 18k gold, ring size 6 - Estimate $550,000 - $650,000

With report 16383271 dated 3 September 2008 from the Gemological Institute of America stating that the diamond is fancy intense yellow, natural color, VS2 clarity

A superb rectangular-cut colored diamond ring

The fancy intense yellow diamond, weighing approximately 20.42 carats, mounted in 18k gold, accompanied by three mountings and a screwdriver - Estimate $400,000 - $600,000

May be worn as a pendant necklace, designed as a pear-shaped and circular-cut diamond frame, from an inverted pear-shaped diamond link, to the fine link neckchain, spaced by collet-set diamonds, mounted in platinum and 18k gold, 17¾ ins., may also be worn as a shorter necklace, 14¾ ins.

May also be worn as a bracelet, designed as a band of pear-shaped and circular-cut diamonds, mounted in platinum and 18k gold, 6½ ins.

May also be worn as a ring, the shoulders set with cut-cornered triangular-cut diamonds, weighing approximately 2.16 and 2.09 carats, to the channel-set baguette-cut diamond hoop, mounted in platinum and 18k gold, ring size 6¾
With report 15254921 dated 4 December 2008 from the Gemological Institute of America stating that the diamond is fancy intense yellow, natural color, internally flawless clarity, with excellent polish and excellent symmetry

With reports 15054178 and 15236599 dated 19 and 26 September 2008 from the Gemological Institute of America stating that the cut-cornered triangular-cut diamonds, weighing approximately 2.16 and 2.09 carats, are D and E color, internally flawless clarity

With ten reports dated from 18 January 2007 to 1 August 2008 from the Gemological Institute of America stating that ten of the pear-shaped diamonds, weighing from approximately 0.52 to 1.33 carats, range from D to E color, and from internally flawless to VS2 clarity (4)

A colored diamond ring

Set with a modified cushion-cut light yellow diamond, weighing approximately 9.09 carats, flanked on either side by a half-moon diamond, mounted in platinum and 18k gold - Estimate $35,000 - $50,000

A suite of colored diamond jewelry

Comprising a necklace, designed as a graduated openwork band of vari-cut yellow diamonds, trimmed by circular-cut diamonds; and a bracelet en suite, mounted in 18k white and yellow gold, necklace 16½ ins., bracelet 7¼ ins. (2) - Estimate $35,000 - $50,000

Christie's. New York Jewels. 10 December 2009. New York, Rockefeller Plaza www.christies.com