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AN UNHEATED 6.43 CARAT SAPPHIRE AND DIAMOND DRESS RING set with mixed octagonal step cut sapphire of 6.43 carats within a frame of round brilliant cut diamonds, the shoulders set with further diamonds, inscribed 0.80D 6.43S, stamped PT900, size N / 6.75, 7.7g. Accompanied by a GIA report stating the sapphire shows no indication of heat treatment.