Tuning Ceramic Resonator Rods By Grinding

Is there a better grinding wheel than diamond which I can use to grind ceramic resonator rods? Currently, I'm using 100 grit diamond wheel mounted on a toolpost grinder on a hardinge toolroom lathe. The result is not satisfactory. I cannot prevent chipped edges. The requirement is maximum of 4 chip outs no more than .005" wide.

Thanks,

Chito