Saffron is more expensive by weight than gold.
Why it is true
Tens of thousands of saffron flowers, harvested by hand, are needed to produce just a few grams of the spice, making its price per kilogram higher than that of the precious metal.
Source: Agriculture Econ
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Related facts
Saffron is the most expensive spice in the world, measured by weight.
Saffron is the most expensive spice in the world by weight, requiring about 75,000 flowers for one pound.
Vanilla is the 2nd most expensive spice in the world.
Saffron is the most expensive spice in the world because it must be harvested entirely by hand.