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Saffron
Saffron is said to be more expensive than gold – and this was literally true for centuries. Cultivating it is a very tedious and labor-intensive task: the spice itself is the dried stamen of the crocus plant that has to be harvested manually, and each plant has just three of these. To produce one pound of dried saffron, one needs a field the size of a football field. Depending on the variety and the country of origin, the retail price of saffron can be anywhere between $2,000 and $20,000 per kilogram.