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Californium
This element was first developed in 1950 at the University of California Radiation Laboratory, by bombarding curium with alpha particles. Since then only few gram of it has been produced. The estimated cost of one gram californium is about $27 million, which make perfect sense considering the fact that the global production of californium is half gram per year.
Carbon
Carbon is one of the most essential elements for life. Although a large amount of it is present in all of our bodies, and things like coal and graphite aren’t expensive as we all know. But if carbon atoms arranged in certain order it can have an extremely high value. In the form of diamond, carbon can cost you as much as $65,000 for one gram.
