This quite unusual and modern necklace has been made using natural pink tourmaline interspaced with silver beads, and finished with a silver chain and clasp.  All silver is 925 sterling silver.
 
The necklace is 18 inches / 45 cms long of which the tourmaline and silver bead secton is 10.5 inches / 27 cms long.  The rest of the necklace (7.5 inches / 19 cms) is made of silver chain and the clasp.