Antique Diamond Riviera Necklace with approximately 13.00 carats. The center diamond is an antique cushion cut and measures 7.40x7.00x3.90mm and weighs approximately 1.85 carats.The two diamonds flanking the center stone weigh approximately 1.00ct each and then the necklace graduates to .10 carats The diamond in the clasp weighs approx. .65 carats There are 48 total diamonds in the necklace and all are antique cushion cut. The diamonds range in clarity from Vs-SI and the color from G-I. The necklace is set in gold.