birthstone
/ˈbɜrθˌstoʊn/
noun
- A gemstone associated with a person's birth month, often worn as jewelry for good luck or as a personal symbol.
- She received a necklace with her birthstone, a sapphire, for her birthday.
- The jeweler explained that the garnet is the birthstone for January.
- Many people choose a birthstone ring to represent each family member.