The primary corundum deposit in eastern Hebei is near the ground surface.The corundum is megacrysts, pink or dark red color, semi-transparence to opaque.

• 冀东某地原生刚玉矿床具有埋藏浅，刚玉个体大、微红至暗红色、半透明至不透明等特点，经人工改善可生产低档红宝石。