Smooth polished 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: 18mm long, 13mm wide and 4.5-5.5mm thick. Quantity: 2 Cabochons Due to the nature of this gemstone, there will be some variation amongst the pieces, including inclusions and color."