Multi-colored sapphire and diamond necklace

The necklace alternately set with 36 square-cut sapphires in various natural fancy colors weighing 56.84 carats, spaced by  34 square emerald-cut diamonds weighing 20.11 carats, mounted in platinum, length 16 inches. 

Accompanied by 27 GIA reports stating that the sapphires are of natural color; no evidence of heat treatment detected.