Semiprecious Onyx Necklace. Necklace Size: 17 Inch + 2 Inch link=19Inch Bead Size : 10-13mm This beautiful necklace is made of lovely faceted Onyx beads and .925 sterling silver disc spacers.And needs no layering & can be worn on its own. A very elegant piece to have in your jewelry collection or give a gift to someone special! This stunning Onyx necklace will come in a 4316Designs box. Enjoy browsing the pictures.