This beautiful black onyx gemstone is a natural and faceted cut octagon shape. It is available in all sizes, measuring between 5x7mm and 15x20mm. The gemstone has excellent cut grade and eye-clean clarity grade. The black color of the gemstone is opaque and natural, created in India and originating from Australia. It has not been enhanced or treated in any way, making it a completely natural gemstone. The gemstone is perfect for jewelry and watches, and is a great addition to any collection.