Net Weight: 7.20 carats Or 1.44 gram Net Size: 25x6mm Shipping: Registered Mail Delivery Time: 10-12 working Days Stone Features: Its 100% Natural Paraiba Tourmaline Origin: Afghanistan.. 004 Tourmaline Crystal is a powerful Stone for protection against negative energy of all kinds, as well as being a strong spiritual grounding stone. This is one of the most popular crystals to be used for metaphysical purposes. Many people,believe this is the best protection stone that you can use. Also known as Schorl, it encourages positive attitudes, good luck and happiness, regardless of the circumstances that you find yourself in.