The Diamond Concave Engraving Wheel is a highly versatile tool that is designed to help you achieve precision results in your lapidary, glass, woodturning, and leather working projects. With a 1" arbor, this wheel comes with bushings that allow you to adapt it to 1/2, 5/8, or 3/4 inch shafts, making it easy to use with a variety of different tools.

Diamond Concave Engraving Wheel,Diamond Nickel Bonded Concave Wheel,Diamond Profile GrindingWheels and Diamond Arc Grinding Wheel are perfect for rounding edges. What they excel at however is making small beads by hand and without any machines when you want making bead in home. The process is quite easy. First, block out your bead to the required size and pre-drill the bead hole.Our concave diamond wheels are designed with a curved surface which provides an excellent way to carve and grind concave forms into glass and stone. The rounded concave design allows high visibility grinding at the point of contact. We have a variety of different grits available in 4", 6" and 8" diameter wheels,Arbor is 1" and comes with bushings to adapt to 1/2, 5/8 or 3/4 inch shafts.
You then round the bead as well as you can on a normal grinding wheels to remove the square edges. After this hold the roughly rounded bead using a pin vice and grind one side of the bead using the concave wheels. When you are happy with the shape, reverse the pin vice and grind the other side. If you are using the coarse grit concave wheels to do the grinding you may need to use a finer grit concave wheels  to remove some of the scratches.
The easiest way to get to a finished high polish is to then use a rock tumbler and go through the normal process of tumbling.