3.5-inch copper semi-circle with an oval faceted amethyst set in the middle, attached to a 16-inch copper chain. 
 
Magical properties of amethyst: 
Balances energies of the intellectual, emotional, and physical bodies
Clears your aura while stabilizing and transmuting dysfunctional energy within your body 
Conducts energy of calm and peacefulness
Assists with the adoption of new ideas

Reference: Love is in the Earth: A kaleidoscope of crystals by Melody