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.
- laboratory bench
- laboratory chest
- laboratory conditions
- laboratory frame
- laboratory school
- laboratory system
- laboratory technician
- laboratory test
- labor bank
- labor bill
- labor book
- labor brigade
- labor bureau
- labor candidate
- labor class
- labor coach
- labor colony
- labor content
- labor cost
- Labor Day Weekend
- labored
- laborer
- laborer in trust
- Labor government
- labor hero