IPA: /dʒɛm/
KK: /dʒɛm/
Decorated with objects that look like precious stones.
The crown was beautifully gemmed with sparkling jewels.
Gemmed → It is formed from "gem" (from Old French *gemme*, meaning precious stone) and "-ed" (a suffix used to form the past tense or to indicate a state). The word "gemmed" means adorned with or having gems or precious stones.
Think of a precious stone ('gem') that has been 'adorned' or 'decorated' with more gems, which is what 'gemmed' signifies.