Sotheby's, Geneva, November 2002

Lot 330 Fine Sapphire Ring

Claw-set with an octagonal step-cut sapphire weighing 23.45 carats, mounted in 18 carat white gold, size 53.
Accompanied by GRS report no. GRS2002-071046 respectively, both stating that "gemological testing revealed characteristics consistent with those of sapphires originating from Burma, no indications of thermal enhancement."

With GRS special comment : ' extremely rare combination of size, brilliancy, excellent clarity, color type 'royal blue' and absence of heat enhancement'.
US$ 470,000-500,000