noun
jewel
JOO-uhl/ˈdʒuːəl/
A valuable ornamental gemstone.
A large emerald jewel sits securely in the gold ring's prongs.

Etymology
Jouel named an ornament or gem, and jewel initially meant a valuable article used for adornment. Its more restricted precious-stone sense developed within English; the French word’s deeper ancestry is uncertain.
In context
the three jewels that have been selected for the design, the green jewel at the top is a peridot,
More examples
- The crown is set with dozens of tiny jewels.
- The jeweler inspects each jewel before setting it in a ring.
- A single jewel is missing from the antique brooch.