NounEdit. corundum (countable and uncountable, plural corundums). (mineralogy) An extremely hard mineral, a form of aluminum oxide with the chemical formula 

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If these crystals are indeed natural corundum, they have in fact been artificially dyed with an organic coating to give them these bright colors (blue, red, 

The color of corundum gems is therefore determined by trace element impurities that are in solution in the corundum lattice. Such gems are referred to as allochromatic ("other colored"). "In solution" is an important distinction to make. Sugar dissolved in water is "in solution.". Fine sand stirred into water is not.

Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks. It is an aluminum oxide with a chemical composition of Al2O3 

Corundum is the hardest mineral After diamond on Earth. The name corundum comes from the Sanskrit kuruvinda, meaning “ruby” the name given to red corundum.

Corundum is a mineral species best known for its two popular gemstone varieties, sapphire and ruby. All colors of corundum except red are known as sapphire. The term sapphire, when

Check out our corundum selection for the very best in unique or custom, handmade pieces from our gemstones shops.

ABOUT CORUNDUM. Founded in , Corundum Open Innovation is an Israel-Japan venture capital firm, backed by Japanese corporations, investing in top Israeli high-tech companies and top Israeli funds. With teams in both Japan and Israel, Corundum provides quality access to the Israeli High-Tech Eco System and hands-on business development for

Corundum has been historically known by many names: ruby, sapphire, hyacinthos, asteria, adamant, etc. Originally named "corinvindum" in 1725, this gemstone's 

Corundum Blue is an RAL Design color with the number 220 40 10. Different from the Classic list, the RAL Design catalogue specifies colors for interiors. RAL is a well-known color matching system used in several European countries including Germany, France, Italy and the UK. Corundum Blue hex code is #4A6267 with equivalent RGB (74, 98, 103).