Diamond is rated as a 10 on the Mohs hardness scale, but only because it is the only natural gem harder than corundum (sapphire and ruby) which are a 9 on the scale. In reality, diamond is more like a 41 -- its not just a little harder than corundum, but mucher harder.
Diamonds are mined in South Africa, Australia, Siberia, Canada, Brazil and a few other lesser places. Most gem-quality diamonds mined are a light yellow or light brown color, but the stones occur naturally in every color of the rainbow, including colorless (which is the most popular for jewelry), milky translucent white and opaque black.
The Tiffany Yellow, yellow, 128 cts.
The Wittelsbach, medium blue, 35 cts.
Jennifer Lopez's pink diamond, 6 cts.
The Amsterdam, black, 33 cts.
The Hope, dark blue, 45 cts.
The Allnatt, golden yellow, 101 cts.
The Star of South Africa, colorless, 47 cts.
The Pumpkin, orange, 5 cts.
The Conde, pink, 9 carats.
The De Beers, light yellow, 234 cts.
The Incomparable, brownish-yellow, 407 cts.
The Copengagen, blue, 51 cts.
The Polar Star, colorless, 41 cts.
The Victoria-Transvaal, brownish-yellow, 67 cts.
The Millennium Star, colorless, 203 cts.
etc etc etc
Brendon: Yeah I saw her last period. She wasn't trying to talk to me and she's pretending we didn't almost hug yesterday.
Marsha: You guys have been together lately, everyone thinks you like each other.
Brendon: I thought she liked me but she ditched me last week. cocktease