18K Gold Diamond Mangalsutra Necklace W/ 1.36ct VS-SI Diamonds for women. This beautiful 18K gold Mangalsutra necklace features a unique pendant encrusted in 1.36ct VS-SI round brilliant diamonds with F-G color. This beautiful symbol of matrimony features a black beaded necklace 18 inches long and 3 mm wide. Its elegant pendant is 33 mm long and 50 mm wide. This diamond Mangalsutra necklace has a total gold weight of 10.3 grams.