Smoky black Tourmaline stone 1.high quality 2. excellent machine cut crystal ... lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gem comes in a wide variety of colors ... sizeQualityAAAAA,AAAA,AAA,AA,ARecommended this product toJewelry maker,jewelry wholesaler,fashion dress company,souvenir maker,gift maker,ahd ... or according to your requirement Smoky black Tourmaline stone