Gold is not the most expensive substance in the world, when recalculated per gram. And not even platinum.
Plutonium. Cost: about 4000 dollars per gram. Heavy fragile radioactive metal is silvery white. In the periodic table is located in the family of actinides. Widely used in the production of nuclear weapons, nuclear fuel for nuclear reactors
Painit. 9 thousand dollars per gram or 1,800 dollars per carat. This stone is so rare that few have heard of it. However, in the world of precious stones, rarity and beauty are not equivalent concepts.
Diamonds. Cost: 55 thousand dollars per gram. Colorless stone can cost more than 11 thousand dollars per carat, and colored diamonds are much more expensive. A diamond is a diamond, which, through the treatment, is given a special shape that maximizes its natural brilliance.
Antimatter. Cost: 62.5 trillion dollars per gram. Antimatter is known as the most expensive substance on Earth, according to NASA estimates in 2006, the production of a milligram of positrons cost about 25 million US dollars. According to the 1999 estimate, one gram of anti-hydrogen would cost 62.5 trillion dollars.