A magnificent ruby, sapphire, emerald and diamond necklace, by Bulgari. Photo Christie's Image Ltd 2014

Designed as a graduated fringe of cabochon sapphires embellished with cabochon rubies and brilliant-cut diamonds, suspending five cabochon rubies weighing 11.89, 10.12, 9.59, 7.86 and 5.48 carats, each within a brilliant-cut diamond surround, linked throughout by cabochon emeralds and accented further by brilliant-cut diamonds, mounted in 18k gold, 38.7 cm long, in pink leather Bulgari case. Signed Bulgari. Estimate HK$4,000,000 – HK$6,000,000 ($518,450 - $777,675)

Accompanied by report no. 72268 dated 16 January 2014 from the SSEF Swiss Gemmological Institute stating that the 11.89, 10.12, 9.59, 7.86 and 5.48 carat rubies are of Burma (Myanmar) origin, with no indications of heating.

Christie's. HONG KONG MAGNIFICENT JEWELS, 27 May 2014, Convention Hall - http://www.christies.com/