This question is admittedly so stupid I'm almost ashamed to ask... But here goes. Flame me if you must.
Fossil fuels are carbon-based energy. Oil and coal are formed from organic matter being compressed and heated for millenia. Diamonds are what comes next after coal, right? If you continue to compress and heat coal for more millenia you get diamonds, more or less?
Is there energy contained in diamonds and/or other gemstones? If so, is there any way to release this energy?
obviously it's not economical i'm just curious...