Made of amethyst stones with a cluster of  Indonesia Amethyst.  Arrange using stainless steel wire, copper, and brass. 
Lenght: 50cm + 5 cm extension chain 
See more the properties of the metal and stone here:
Copper: https://www.ehow.co.uk/info_8599119_benefits-cons-copper-jewelry.html
Brass: https://www.jewelryshoppingguide.com/what-is-brass-jewelry/
Amethyst: https://www.healthline.com/health/amethyst-healing-properties