Statistics for Most Expensive Substances (by Weight)

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$/gram	Category	Clue	Substance	% Correct
55,000	Precious stone	Often used in engagement rings	diamond	92%
40	Metal	King Midas	gold	92%
215	Drug	Pablo Escobar	cocaine	90%
110	Drug	Walter White	methamphetamine	68%
120	Drug	Kurt Cobain	heroin	67%
4,000	Radioactive metal	Needed for flux capacitor	plutonium	62%
31	Metal	Name from Spanish for "little silver"	platinum	59%
35	Food	Found primarily in the Caspian Sea	Iranian beluga caviar	53%
11	Spice	From the Crocus sativus flower	saffron	45%
3,000	Drug	Timothy Leary	LSD	40%
7	Food	Subterranean	white truffle	40%
21,080,000,000	Positrons, for example	Positrons, for example	antimatter	29%
90	Animal product	Consists of keratin	rhino horn	26%
27,000,000	Element	Most expensive element	californium	9%
27,813,000,000,000	Liquid	Used in computer technology	printer ink	9%
30.5	Metal	Name from Greek for "rose"	rhodium	8%
30,000	Gas	Used in lighting signs	tritium	2%
20,000	Precious stone	Discovered by Richard Taaffe	taaffeite	1%