Smooth polished black onyx gemstone. Flat back oval cabochon beads, suitable for gluing into bezel settings, onto flat back bails, even directly on to fabric. There are many suitable adhesives - one that we recommend is E6000. Cabochons have a flat back and are not drilled. This cabochon has a classic oval shape with a smooth surface. Please check dimensions to make sure they will fit your project. Approximate Measurements: 40mm long, 30mm wide and 7-8mm thick. Quantity: 1 Cabochon Due to the nature of this gemstone, there will be some variation amongst the pieces, including inclusions and color."