precious stone 
noun
A highly attractive and valuable piece of mineral, used especially in jewellery; a gemstone: a dazzling inlay of precious stones...
- The range of geological subjects is wide: minerals, rocks, precious stones, and the means of working them.
- Traders in Livingstone have been urged to start dealing in gemstones to sell the precious stones to the many tourists who visit the tourist capital.
- Much of the jewellery is set with precious stones.
- convergence zone
- convergency
- convergent
- conversable
- conversance
- conversancy
- conversant
- conversate
- conversation
- conversational
- conversationalist
- conversationally
- conversation lolly
- conversation piece
- conversation-stopper
- conversazione
- converse
- conversely
- converser
- conversion
- conversion factor
- conversion rate
- conversion van
- convert
- converted rice