Can Lava Melt Diamonds?

To put it simply, a diamond cannot melt in lava, because the melting point of a diamond is around 4500 °C (at a pressure of 100 kilobars) and lava can only be as hot as about 1200 °C.

Can anything melt a diamond?

If you heat the diamond in the open air, it will begin to melt and burn at around 700 degrees Celsius (1,292 degrees Fahrenheit). Burning a diamond without oxygen, however, will make it change into graphite (a crystalline form of carbon) before transforming into a fluid.

What could destroy a diamond?

Hammer – Physical Force. This is the most common way that people use to destroy diamonds. Let us just say that people who do this do it mainly for research purposes and not for fun. Diamonds are extremely expensive because they're hard to find and even harder to shape into shapes that are familiar to us.