The color of Ruby fused alumina is darker than the pink fused alumina grain. The chromium oxide content added during the smelting process is 1-2%, and its self sharpening property is higher than that of brown fused alumina, and its toughness and wear resistance are higher than that of white fused alumina. The addition of chromium oxide improves the impact resistance and mechanical strength of corundum crystals, making it particularly suitable for producing grinding wheels and gear grinding wheels. For materials such as quenched steel and high-speed steel, the grinding efficiency is 1-2 times higher than that of ordinary grinding wheels, and the service life is increased by 4 times, greatly improving the processing efficiency.