Diamonds - $55,000 / Gram

Diamond is a crystalline form of pure carbon. It is the hardest known mineral. We all know how diamonds are used in precious jewelry. These pricey carbon compounds are also used as industrial blades and knives because of their hardness. It is a known fact that only a diamond can cut another diamond. Natural diamonds are very expensive. The pure diamonds, with respect to other relevant factors, have a price tag of $55,000 a gram.

This Post Belongs To 15 Most Rare and Expensive Materials In The World