To cut heart shape diamond generally 2 type of degree is used . 70 degree wheel and 90 degree wheel based on size of diamond and method of cutting . for small size diamond we prefer to use 70 degree wheel and for large size diamond 90 degree is enough for groove . For customized broad groove heart shape diamond 120 degree is also used . generally 3 or 5 wheel is used by 1 machine. for rough work of groove and final shapping other wheel is used .our  heart cut grooving wheel is used in any machine . we maintain all dimension so worker can work in all machine .