Red corundum is not a natural stone?

Red corundum is not a natural stone?

Red corundum is a natural stone.The main compounds of red corundum are alpha alumina, also known as chrome corundum, ruby. Now the market is generally artificial corundum. The processing method is based on the addition of 22% of chromium to the base of white corundum. Color purple red. The hardness is slightly higher than that of the brown corundum, which is similar to that of the white corundum, and the microhardness is 2200-2300Kg/mm2. Toughness is higher than white corundum, slightly lower than brown corundum. The abrasive tools made of it are suitable for grinding high carbon steel, high speed steel and thin-walled parts, also can be used as abrasive grinding and polishing materials, precision casting sand, spraying and coating materials, catalyst carrier, special ceramics, advanced refractories etc..

Red corundum is a natural, unprocessed ruby. You said, "jade", there is no such thing! In addition, did not see the real thing, not good for identification.