18ct gold and ancient coin 'Gemme Nummarie' necklace, Bulgari, circa 1980, the flat curb link chain centring a framed Roman bronze coin of Emperor Constantine I, the reverse of the circular frame engraved Heraclea-Constantinus I AUG. A.D.307-337, gross weight approximately 64.8 grams, circumference approximately 400 mm, signed Bulgari, Italian registration marks, accompanied by a Bulgari case.