Mangalsutras, these are basically 22k gold necklaces which contain black beads, in their designs, the black beads are just plain synthetic beads or in some cases onyx beads. The mangalsutra is a necklace which in most eastern cultures, is presented during the wedding ceremony, to the bride. The mangalsutra symbolizes the trust, love and devotion between the married couple.  Mangalsutras are available in various styles, lengths, some very casual, for daily wear and some very oranate, with filigree designs and stones.