I'm guessing similar to the diamond blades and pads used to cut granite. The edges usually aren't sharp, the blades are usually pretty wide, 1/8" kerf, but they

I'm guessing similar to the diamond blades and pads used to cut granite. The edges usually aren't sharp, the blades are usually pretty wide, 1/8" kerf, but they're encrusted with diamonds. The blades don't usually get dull, they just wear down until the diamonds are gone. The diamonds not the blade itself does the cutting. Once the diamonds are gone, the blade will actually start melting and stuff.