2X2~ 10x10mm square 3 #red corundum, high temperature resistant and waxable synthetic ruby, pointed bottom loose stone

 Synthetic corundum heat resistance 1800 degrees Celsius

Main purpose:Jewelry Inlay, Jewelry DIY

Product features:High temperature resistance, for fire, wax setting will not change color

Hardness:Synthetic corundum has a Mohs hardness of 9, diamond is 10.

Defect:Synthetic corundum is basically flawless inside and out.

Natural corundum is rarely flawless inside and outside.