I rather like that idea but the resulting diamonds seem a bit large for industrial diamonds (lifegem.com)
But then I don't know a great deal about the advances in recent years.
Personally I want to be buried, preferably in the Phils beside the rest of our family, I have been there on All Saints day, if I am buried in the Phils I will never be alone
Ultimately our sun will cremate us all, I can wait a few billion years before my elementary particles end up in a white dwarf or get blown away in the final breaths of the suns solar wind in its red giant stage.
Sadly our sun is not big enough to become a supernova which could blast all of our constituent parts back out into the universe for a further cycle of creation.
Wait a good bit longer and the 'Big Rip' will get even the cold black remains of burnt out stars like ours
Jim