Polycrystalline Diamond Cutters:  The cutters are man made, they have the hardness of a real diamond.  They are used on concrete floor polishing machines, in the oil and gas industry in the drill bits and for water well drilling bits.  The size that I am selling is 1308, they are 13 MM diameter by 8 MM thick.  I am selling in a set of 50, I am not interested in selling them seperately.  $750., no haggle price, in Escondido, call (760)746-7209