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.
- actionless
- action painter
- action painting
- action potential
- Actium
- activate
- activated charcoal
- activation
- activation analysis
- activator
- active
- active galactic nucleus
- active galaxy
- active immunity
- actively
- active-matrix
- activeness
- active recreation
- active site
- active transport
- activewear
- activin
- activism
- activist
- activistic