This necklace features a black tourmaline power stone with a gold pin chain. You can remove the chain and thread your own beads through it. It cuts electromagnetic waves, making it the perfect necklace for those who always carry their smartphones. Black tourmaline is known as a powerful protective stone, believed to ward off negative energy and malice. Its deep black color is characteristic, grounding energy and helping to relieve stress and anxiety. It is also said to have electrical properties and protect against electromagnetic waves. The simple design makes it easy to match with various fashions. [Color] Black (stone), Gold (chain) 42 cm. [Materials] Brass, resin, natural stone, pearl beads 10mm. Thank you.