Glittering Stones >> Semi Precious Stones >> Corundum

Semi Precious Stone Corundum

Corundum is the second hardest natural mineral according to science. The hardest mineral, diamond is still four times harder than the corundum. The hardness of corundum could be partially attributed to the strong and short oxygen-aluminum bonds. These bonds pull the oxygen and also aluminum atoms close together, making the crystal not only hard but quite dense for the mineral made up of two relatively light elements.

Historical Facts of Corundum Refractive index 1.768 - 1.772, 1.760 - 1.763 Hardness 9 Category Mineral Chemical Composition Trigonal Hexagonal Scalenohedral Color Brown, yellow, red, blue and violet colors Major varieties Sapphire, Ruby, Emery

Precious corundum Jewelry

Corundum Bracelet

Corundum Earring

Corundum Necklace

Corundum Ring