What is the world's most expensive spice by weight?

Online Answer
SaffronSaffron has long been the world's costliest spice by weight. Although some doubts remain on its origin, it is believed that saffron originated in Iran..
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One reason people have embraced saffron is its purported effect on their baby's skin tone. Some cultures hold that saffron will make your baby's skin lighter. However, there doesn't seem to be any scientific evidence that consuming saffron while pregnant will have this effect.
While the myths arouse discord, there's one item of consensus: Kashmiri saffron is the sweetest, most precious spice in the world. Its strands are thicker and more fragrant than its counterpart from Iran, which accounts for more than 90 percent of the world's saffron production.