[LibWhacker]

As explained in the article, when you heat up diamond it doesn't go directly from solid diamond to liquid diamond, but physically changes into graphite first. Then the graphite melts (which, of course, only tells you the melting point for graphite, but not diamond).

[raybbr]

I used to work at U.S. Steel. We had graphite up to six inches thick covering everything in the BOP shop. It played havoc with the resistor banks on the cranes.