18K Yellow Gold Diamond Mangalsutra Necklace W/ 1.38ct VS-SI Diamonds for women. This beautiful 18K yellow gold Mangalsutra necklace features a unique pendant encrusted in 1.38ct 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 28 mm long and 43 mm wide. This piece has a total gold weight of 9.9 grams.