Blue tourmaline, also popularly known in the gemstone trade as indicolite, is one of the rarest and most highly sought-after color varieties of the tourmaline mineral family. Characterized by its stunning shades ranging from light sky blue to deep, rich teal or indigo, this crystal owes its vibrant color to trace amounts of iron within its complex borosilicate structure… From Afghanistan Weight : 10 grams Size : 20x9x9mm 18x7x7mm 15x8x6mm 10x5x5mm