18K Yellow Gold Diamond Mangalsutra Necklace W/ White Gold Diamond Smile Pendant for women. This gorgeous Mangalsutra necklace features a single-strand yellow gold chain with black beads as well as a white gold smile pendant encrusted with 1.36ct VS-SI round brilliant diamonds. The chain is 18 inches long with a width range of 0.5-2.25 mm. Its pendant is 19 mm long and 43.5 mm wide. Ideal for dressy attire, this exquisite piece has a total gold weight of 8.7 grams.