Fine 6.03 carats Mozambican "Pigeon's Blood" Ruby and Diamond Ring. Estimate HK$1,650,000 - 2,600,000 (US$211,500 - 335,000). Photo Tiancheng International

Centring on a heart-shaped ruby weighing 6.03 carats, to a stylised mount decorated with tapered baguette, trilliant and calibré-cut diamonds together weighing approximately 5.50 carats, highlighted by circular-cut rubies together weighing approximately 5.20 carats, mounted in 18 karat white and pink gold. Ring size: 6¾

Accompanied by SSEF report numbered 81597, dated 24 August 2015, stating that the 6.03 carat ruby is natural, Red colour of medium strong saturation, of East African origin, with no indications of heating;

LOTUS report numbered 5495-8268, dated 14 July 2015, stating that the 6.03 carat ruby is natural, Red colour, of vivid saturation and medium-deep tone, of Mozambican origin, with no indications of heating or treatment; with a colour type note stating that 'The highly saturated crimson colour of this gem earns it the LOTUS "Pigeon's Blood" distinction';

GRS report numbered GRS2015-050117, dated 4 June 2015, stating that the 6.03 carat ruby is natural, Vivid Red colour, of Mozambican origin, with no indication of thermal treatment; with a special appendix stating that 'This vivid red ruby from Mozambique is reminiscent in colour saturation of "GRS-type pigeon blood ruby". 

Tiancheng International. HONG KONG AUTUMN AUCTION, Jewellery and Jadeite