18kt white gold and diamond collier

brilliant cut with amethyst with pendant and volute patterns: a brilliant-cut diamond approx. 0.80 ct, two brilliant-cut diamonds approx. 1.40 ct, two brilliant-cut diamonds approx. ct 1, two brilliant-cut diamonds approx. 0.80 ct, two brilliant cut diamonds approx. 0.75 ct, three navette-cut diamonds ct approx. 0.65 ct, and other brilliant cut and huit-huit diamonds for a total total of approx. ct 12, VVS/VS purity and I/J color, length 42.5 cm . Provenance of Cusi Milano Jewelery, peso 65,7 cm.