Can diamonds be made of helium and hydrogen?

Answer 1

This could be a trick question. A diamond is an allotrope of the element carbon. In stars, which are giant fusion engines, hydrogen is fused into helium, and helium is fused into carbon. In a round about way, yes, diamonds can be made of helium and hydrogen. The carbon can be compressed and heated in a supernova at the end of its life, and diamonds can form. The carbon has to be transformed into diamond. But they diamonds are very, very tiny. Some meteorites contain thousands of diamonds, but they are so small that it is hard to see them with an optical microscope.