AN EXTREMELY RARE ART DECO STEEL GRAY DIAMOND RING, CIRCA 1925

SOLD

A ring composed of a prong-set gray rectangular-cut diamond; mounted in platinum, with French assay mark

  • 1 rectangular-cut gray diamond, weighing 10.67 carats

Additional cataloguing

Certification

  • Gübelin Gem Lab Diamond Report no. 11110137, dated December 14, 2011, stating that the 10.67-carat octagonal step-cut is fancy gray color and SI1 clarity.
  • Gübelin Gem Lab Note to Diamond Report no. 11110137 stating that based on its infrared spectrum, the 10.67-carat diamond is classified as a type IIb (a chemically very pure type of natural diamond).
  • Gübelin Gem Lab Appendix to Diamond Report no. 11110137 stating “Large diamonds over 10 carats exhibiting such a pure ‘steel gray’ color are rarely encountered in the trade.”
  • Gemological Institute of America Diamond Grading Report no. 2135796072, dated August 31, 2001, stating that the 10.67-carat emerald-cut is fancy gray in color with even distribution and SI1 clarity.
  • A Letter Concerning an Important Diamond from Stephen C. Hofer of Fancy Colour Consultants, dated March 6, 2012, stating “The size, clear transparency, pure gray color, and the beautiful blend of gray color tones seen in the face-up direction—combined with the charm, and style, and character of an emerald cut that was most likely polished in the 1920s—makes this particular Fancy gray stone stand out from all the other Fancy gray diamonds. This is a magnificent, large, and important gem quality Fancy gray diamond.”