Emerald vs. Corundum — What's the Difference?

Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and/or sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale.

Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral.

A bright green precious stone consisting of a chromium-rich variety of beryl

An extremely hard mineral, aluminum oxide, Al2O3, sometimes containing iron, magnesia, or silica, that occurs in gem varieties such as ruby and sapphire and in a common black, brown, or blue form used chiefly in abrasives.

A bright green colour

(mineral) An extremely hard mineral, a form of aluminum oxide with the chemical formula Al₂O₃, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.

A slender-bodied green moth, the colour of which tends to fade as the moth ages.

The mineral alumina (Al2O3), as found native in a crystalline state. Transparent varieties are used as gemstones, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.

A hawker dragonfly with a metallic green body.

Very hard mineral used as an abrasive

A small hummingbird with bright metallic green plumage and darker wings and tail, found mainly in the area of the Caribbean and Central America.

Bright green in colour

A brilliant green to grass-green transparent variety of beryl, used as a gemstone.

A strong yellowish green.

Of a strong yellowish green.

Any of various green gemstones, especially a green transparent form of beryl, highly valued as a precious stone.

Emerald green, a colour.

Any hummingbird in the genera Chlorostilbon and Elvira; and some in the genus Amazilia

(entomology) Any of various species of dragonfly of the family Corduliidae.

A size of type between nonpareil and minion, standardized as 6½-point.

Of a rich green colour.

To ornament with, or as if with, emeralds; to make green.

A precious stone of a rich green color, a variety of beryl. See Beryl.

A kind of type, in size between minion and nonpare l. It is used by English printers.

Of a rich green color, like that of the emerald.

A green transparent form of beryl; highly valued as a gemstone

A transparent piece of emerald that has been cut and polished and is valued as a precious gem

The green color of an emerald