A refractory coating (28) extends over a portion of a diamond cutting blade (10) comprising a disc-shaped body (12) having an edge on which is positioned one or more cutting segments (14). One or more grooves (40, 42) are located in the sides of the blade body. The coating (28) is created by spraying a liquid tungsten carbide mixture onto each side of the blade (10) at a speed of over 3000 fps. The tungsten carbide is directed at the blade (10), resulting in a solidified metal coating on each side of the body and which fills in any overhang of the segment(s) beyond the blade body and the grooves in the blade body.