Diamonds on Venus
Date: 1999 - 2000
Would diamonds melt on Venus?
No, as I recall temperatures on Venus range from a few hundred degrees
to maybe a thousand degrees Centigrade. Diamonds are the hardest
substance known because they have a VERY tight crystal structure.
This probably means that liquid diamond (which, of course, whould
just be liquid carbon) could only exist at extremely high pressure.
At ordinary pressures, if you heated a diamond to higher and higher
temperatures, at some point it would sublimate like dry ice changing
into carbon-dioxide gas.
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Update: June 2012