2. Californium 252 – $27 million per gram
The second most expensive substance in the world is Californium 252, another substance you’ve probably never heard of!
This is the heaviest element to occur naturally on Earth, as heavier elements can only be produced by synthesis.
It was first made at the University of California, in 1950 and there aren’t any practical uses for it yet.
So although it is worth a fortune is pretty much useless!
Care to buy some?
