A sapphire and diamond necklace, by Bulgari. Estimate CHF300,000 – CHF500,000 ($325,931 - $543,219). Photo Christie's Image Ltd 2015.

Designed as two lines of alternating oval-shaped sapphires and rectangular-cut diamonds gathered by two diamond-set bows to the brilliant and baguette-cut diamond neckline, mounted in platinum and gold, 41.0 cm, in navy blue Bulgari case. Signed Bulgari 

Accompanied by report no. 15030267 dated 10 April 2015 from the Gübelin GemLab stating that the sapphires are of Burmese origin, with no indications of heating

Christie's. MAGNIFICENT JEWELS, 13 May 2015, Geneva