Thursday, February 27, 2014

Making Industrial Sapphire

See the Mohs scale of mineral hardness. Sapphire is corundum, number nine on the scale.


Stagflationary Mark said...

September 24, 2009
Diamonds Are Forever (Musical Tribute)

By the way, one of the worst techniques in the history of mankind is to simply ask if the diamond is synthetic or natural. This is especially true during a wedding ceremony. If you can't tell by looking at it, then keep your mouth shut. Trust me on this one. Hahaha!

eah said...

"Mohs scale of mineral hardness"

Reminds me of rock, paper, scissors.