Top 16 of the most expensive materials in the world. 16. Saffron - $ 11/gram 15. Gold - $ 56/gram 14. Rhodium - $ 58/gram 13. Platinum - $ 60/gram 12. Methamphetamine - $ 100/gram 11. Rhino horn -$ 110/gram 10. Heroin - $ 130/gram 9. Cocaine - $ 215/gram 8. LSD / auto
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Diamonds are intrinsically worth very little (and are very very common).