if given enough heat will diamond melt into liquid like glass why or why not ?
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Every substance on earth has what is called a “phase diagram”. This shows what temperatures and pressure will create certain phases of that matter (ie gas, liquid, solid). Diamond’s phase diagram shows that the only way for diamond to become liquid is for there to be .01 Giga pascal of pressure. That’s the 100x greater the air pressure at sea level. That also requires temperatures about 4500 Kelvin (about 7600°f).
So yes given enough heat AND pressure you could make liquid diamond.
However we can’t really replicate that on the surface of our planet. We can burn diamond though. The carbon bonds simply break down to do carbon gasses with oxygen.
Edit: even when it is a liquid you wouldn’t recognize it as a diamond. It would just be liquid carbon. All diamond is is a highly regular repeating structure of carbon to carbon bonds that can only be produced inside high pressure and temperature situations like inside out planets mantle.
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