A diamond ring. Photo Christie's Image Ltd 2004

Set with a rectangular-cut diamond, weighing approximately 18.45 carats, flanked on either side by rectangular-cut diamonds, mounted in platinum. Price Realized $287,500

With report 10287657 dated 4 February 1998 from the Gemological Institute of America stating that the diamond is J color, internally flawless clarity
The total weight of the side stones is approximately 4.35 carats

Christie's. MAGNIFICENT JEWELS, 12 October 2004, New York, Rockefeller Plaza. http://www.christies.com/