How to change pencil graphite into diamond.

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Hi mylotters.I came across this interesting article on how to change pencil graphite into diamond using simple things that we can access in our home.But only one thing that I couldn't found is the microwave oven because the one in my is not working now so I can't demonstrate this project in my home.So I want someone here on mylot who would like to demonstrate?Here is the link to the full article(it include pictures) /www.instructables.com/id/how-to-make-synthetic-diamond/