Rare, one of a kind Amethyst. 
Amethyst is a powerful and protective stone. It relieves stress and strain, soothes irritability, balances mood swings, and dissolves negativity.  Amethyst activates spiritual awareness and opens intuition.  It has strong healing and cleansing powers.  It calms and stimulates the mind, helping you become more focused, enhancing memory and encouraging selflessness and spiritual wisdom.
This can be adjustable so you can wear it at the perfect length for you...can go up to 24 inches long.