Important pair of 11.10 and 10.41 carats Burmese Mogok “Pigeon’s Blood” ruby and diamond pendent earrings. Estimate HK$7,800,000 - 12,000,000 (US$1,000,000 - 1,540,000). Photo Tiancheng International

Each centring on a cushion-shaped ruby weighing 11.10 and 10.41 carats respectively, framed by brilliant-cut and pear-shaped diamonds, to a detachable surmount centring on a cushion-shaped diamond weighing 1.02 and 1.01 carats respectively, surrounded by cushion-shaped and oval rubies altogether weighing 6.58 carats, the diamonds altogether weighing approximately 8.45 carats, mounted in 18 karat white and yellow gold.

Accompanied by Gübelin reports numbered 13116108 and 14116064, dated 23 November 2013 and 1 December 2014 respectively, stating that the 11.10 and 10.41 carat rubies are natural, Red and Pink-Red colour, of Burmese origin, with no indications of heating; along with four information sheets stating that the 11.10 and 10.41 rubies are unheated and both from Mogok, Burma; 

GRS reports numbered GRS2013-110168 and 2014-114106, dated 6 November 2013 and 26 November 2014 respectively, stating that the 11.10 and 10.42 carat rubies are natural, Vivid Red (GRS type "Pigeon's Blood") and Red Colour respectively, of Burmese origin, with no indication of thermal treatment; 

LOTUS report numbered 1286-3122, dated 3 August 2015, stating that the 11.10 and 10.41 carat and all other sixteen small rubies are natural, Red Colour, of vivid saturation and medium-deep tone, of Burmese origin, with no indications of heating or treatment. 'The intense crimson colour of this gem earns it the LOTUS "Pigeon's Blood" distinction. Matched sets of untreated Burmese rubies of this size and quality are exceedingly rare'; 

GIA reports numbered 1178165923 and 2176889084, dated 1 April and 26 August 2014 respectively, stating that the 1.02 and 1.01 diamonds are F colour, VS1 clarity, the 1.01 carat diamond with Excellent Polish; another 8 GIA reports, stating that the brilliant-cut diamonds ranging from 0.71 to 0.40 carat, are F colour, VVS2 to VS1 clarity, with Excellent Cut, Polish and Symmetry.

Tiancheng International. HONG KONG AUTUMN AUCTION, Jewellery and Jadeite