Diamond fibers 100-200 mu m in diameter were investigated as electron emitters. Uniform, straight boron doped fibers were grown on tungsten and sapphire fiber cores. The field emitting surface was created by mechanically cleaving the polycrystalline fiber perpendicular to the fiber axis, a procedure in which it was assumed the necessary morphology would be present for field emission. Other than cleaving, no other special surface or bulk treatments were employed. Voltage dependence and noise power spectral density (PSD) measurements were carried out on the field emission current. A subset of the diamond coated sapphire fibers exhibited electron emission at a factor of 5 reduction in the applied field as compared to the tungsten core fibers. Within experimental error, the PSD exhibited a f(-1.5) dependence on frequency.