Lot 1844. Important 6.01 carats Burmese Ruby and 4.25 carats Type IIa Diamond Ring. Estimation on request. © Sotheby’s

Of toi et moi design, set with a cushion-shaped ruby and diamond weighing 6.01 and 4.25 carats respectively, to the circular-cut diamond gallery and shoulders, mounted in 18 karat white gold. Ring size: 5½ 

Accompanied by AGL report numbered CS 69608, dated 11 August 2015, stating that the 6.01 carat ruby is natural, of Burmese (Myanmar) origin, with no gemmological evidence of heat; also accompanied by GIA report numbered 2185055504, dated 6 December 2016, stating that the 4.25 carat diamond is D Colour, Internally Flawless; further accompanied by a diamond type classification report stating that the diamond is determined to be a Type IIa diamond. Type IIa diamonds are the most chemically pure type of diamonds and often have exceptional optical transparency.