gem·ol·o·gy or gem·mol·o·gy 
(jĕ-mŏlə-jē)
(jĕ-mŏlə-jē)n.
The study of gems.
gem′o·logi·cal (jĕm′ə-lŏjĭ-kəl) adj.
gem·olo·gist n.
- dissimulate
- dissimulation
- dissimulative
- dissimulator
- dissipate
- dissipated
- dissipatedly
- dissipatedness
- dissipater
- dissipation
- dissipative
- dissipator
- dissociability
- dissociable
- dissociably
- dissociate
- dissociation
- dissociative
- dissociative identity disorder
- dissolubility
- dissoluble
- dissolute
- dissolutely
- dissoluteness
- dissolution