The beauty of Amethyst! Healing and protective amethyst is a protective stone used to block negative energy. It can protect energy and good for empaths. Each piece was handcrafted with love and care to protect the natural energy of the crystals. Natural Amethyst crystals Purple large chip size - 10 to 12 mm Mohn hardness 7 Findings are nickel free Natural - crystals which are not currently known to be treated. Mohn hardness scale measures the relative hardness of the gemstone/scratch hardness.