In my lecture, my chemistry professor talked about Bonding in Solids. And he asked us whether diamond can melt(in other words, does diamond can have liquid state). And he did not know either. And I was a bit confused. Because in my textbook, it says that Diamond is covalent network solid and Covalent network solid has huge melting point. And I think Diamond can melt. Because if diamond cannot melt, the textbook should say 'with exception to diamond' something like that when putting diamond in Covalent network solid but there was no such word. And besides, they put diamond in category that claims the solids in that category has [melting point]. Can you tell what is right?