Can you convert one allotrope of carbon to the next allotrope of carbon?

Answer 1

From Wikipedia:

"Allotropy or allotropism is a behavior exhibited by some chemical elements: these elements can exist in two or more different forms, known as allotropes of that element. In each allotrope, the element's atoms are bonded together in a different manner."

Conversion, therefore (logically) would mean that one would be able to reduce the carbon allotrope to atoms and then re-assemble them into a different allotrope.

For example, in order to form a diamond allotrope from a group of carbon atoms requires enormous amounts of pressure and temperature.

Answer 2

Yes, it's possible to convert one allotrope of carbon to another through processes like heating or cooling. For example, diamond can be converted to graphite at high temperatures and pressures.