Black Onyx Sterling Silver Necklace. Handcrafted with black onyx beads 11mm x 8mm separated by sterling silver beads. The two beautiful handmade sterling silver beads at the back of the necklace are 14mm x 13mm. The total length of the necklace is 45cm, One of a Kind. This necklace goes with anything and perfect for day or night. All jewelry is sent in a gift box for your convenience.