say it: JEM-stohn
gemstone is a noun meaning "a crystalline rock that can be cut and polished for jewelry". It carries one recorded sense.
a crystalline rock that can be cut and polished for jewelry
“he had the gem set in a ring for his wife”
“she had jewels made of all the rarest stones”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for gemstone come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.