A type of precious stone or gemstone, possibly a variant of garnet or another mineral, known in antiquity.
The etymology is uncertain, possibly from Persian or Arabic origins referring to treasures or precious materials. The term appears in medieval European texts about gemstones but its exact source language remains debated.
Many gemstone names from medieval times are mysteries because they referred to stones using descriptions from ancient traders who never standardized the names. Giansar might be a garnet, might be something else entirely—we still don't know for sure!
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