A ruby, synthetic ruby and diamond necklaceOf bicoloured design, the collet-set cushion-shaped and circular-cut rubies alternating with old brilliant-cut diamonds, to a knifewire backchain and rose-cut diamond clasp, millegrain detailing throughout, one rose-cut diamond deficient from clasp, old brilliant diamonds approx. 2.45cts total, length 36.9cm注脚Accompanied by a report from The Gem & Pearl Laboratory stating that two of the rubies are synthetic. Samples from the remainder are natural rubies, of Burmese origin, with no evidence of heat treatment observed. Report number 18037, dated 8th November 2019.