[Answer] 3. In the high heat and pressure of the inner Earth, this element turns to diamonds.

Step 1 : Introduction to the question "3. In the high heat and pressure of the inner Earth, this element turns to diamonds."

...1. diamondium 2. beryllium 3. diamond is the name of an element 4. carbon Dinosaur dung also can become diamonds after a long, long time. Charcoal has carbon in it.

Step 2 : Answer to the question "3. In the high heat and pressure of the inner Earth, this element turns to diamonds."

carbon:

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