1893 CE
A chemist mistakes a meteorite crystal for diamond.
Read the full sourced page: Moissanite: A Gem From a Meteorite Crater
Myth: undefined
Reality: Moissanite is its own mineral, silicon carbide, with its own crystal structure. It is nearly as hard as diamond (about 9.5 on the Mohs scale) and has more fire, but it is not diamond and is not glass.
Myth: undefined
Reality: Natural moissanite is very rare. Jewellery moissanite is grown in laboratories; it reached the jewellery market in 1998.
The Gem Tray is another reference site by the same author.