Decorated or adorned with gems; set with precious or semi-precious stones; sparkling like gems.
From 'gem' (precious stone) + '-ed' (past participle/adjectival ending). A simple English formation where '-ed' turns the noun into an adjective meaning 'equipped with' or 'adorned with.'
The '-ed' suffix is magical for adjectives—'gemmed,' 'bearded,' 'talented'—it instantly says 'equipped with this quality,' so a gemmed crown is basically a crown loaded with sparkle.
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