Choosing Diamond Blades for Lapidary Saws

Start with your saw

A blade has to fit your saw before anything else. Check three measurements: the diameter your saw is designed for, the arbor (center hole) size, and the thickness (kerf) your flanges and splash guard can accommodate. A blade that does not match will not run true and can be dangerous.

Rim styles

• Continuous rim: a smooth, unbroken edge that gives the cleanest cut with the least chipping. A common choice for cutting gemstones and delicate material.
• Notched or segmented rim: cuts faster and clears debris well, but leaves a rougher edge. Better suited to larger, tougher material where speed matters more than finish.

How the diamond is attached

Sintered blades have diamond mixed through the rim, so as the rim wears, fresh diamond is exposed. Electroplated blades have a single layer of diamond bonded to the surface; they cut freely and cleanly but are done when that layer wears off. Which suits you depends on what you cut and how often.

Make the blade last

• Use the right coolant for your saw, and keep it clean.
• Do not force the rock into the blade. Let the diamond do the cutting.
• If a blade slows down, it may need dressing on a soft abrasive block to expose fresh diamond.
• Store blades flat or hung, and never stack heavy items on them.