Allotropes of carbon dispersion of light of diamond make it useful for both industrial applications and jewelry. Diamond is the hardest known natural mineral. This makes it an excellent abrasive and makes it hold polish and luster extremely well. No known naturally occurring substance can cut (or even scratch) a diamond, except another diamond. The market for industrial-grade diamonds operates much differently from its gem-grade counterpart. Industrial diamonds are valued mostly for their hardness and heat conductivity, making many of the gemological characteristics of diamond, including clarity and color, mostly irrelevant. This helps explain why 80% of mined diamonds (equal to about 100
The Hardest Part (Coldplay song) the German band Kraftwerk; similarly, "The Hardest Part" was intended by Coldplay to acknowledge American band R.E.M. When asked why the song paid a tribute to R.E.M.'s lead singer, Michael Stipe, Chris Martin said: "I've lost all respect for fame, but I haven't lost all respect for respect. So the one great thing about being famous is that I get to meet people who I respect. Our relationship is akin to a dog and its master. I'll always look up to him." The band felt the track resembled R.E.M.'s 1991 single, "Losing My Religion". "The Hardest Part" was left out