10 Most Expensive Materials on Earth.

1. Antimatter - $62.5 trillion/gram.

2. Californium - 252 - $27 million/ gram.

3. Diamonds - $55,000/gram .

4. Tritium - $30,000/gram.

5. Taffeit - up to $20,000/gram or $4000/karat.

6. Painite - $9000/gram or $1800/ karat.

7. Plutonium - $4000/gram .

8. Platinum - $60/gram.

9. Rhodium - $58/gram.

10. Gold - $56/gram