Diamonds are very valuable.There average cost is $3,250 per carat. Diamonds take millions of years and super intense heat in the earth to form naturally.They are the hardest material in the world.Diamonds are made out of carbon.You might have heard that you can make diamonds out of peanut butter.Well its true.You can turn anything made out of carbon (like plants, graphite, plastic, charcoal and many other things) into a diamond under high pressure and temperature. Diamonds are so valuable since they are really rare and are buried deep within the earth.People pay thousands of dollars for diamonds for just one diamond. Diamonds are really valuable.