CORUNDUM. Corundum is one of the types of members of this species. Gemstones containing aluminum oxide which is a most important species of precious gemstones found in Sri Lanka. The situation is taken after the gravel rocks are constantly tightened by water after being deployed. Quality kuruis are very expensive and they are called as dark red and orange pink or padmaraga according to color. According to the colour range of Kuruwinda, the decrease in market value is decided. Basic scientific de