140 Grit Diamond Coated Saw Blade For Cutting Glass, Ceramics & Stones. This is a new diamond coated saw blade. This is made by electroplating diamond particles onto piano wire. Diamond blades are the best quality available at prices well below the competition. This is great for glass, ceramic and stones. This is a 140 grit (medium fine) saw blade. It measures approximately 5 3/8" (147 mm) long.