precious stones

/P R EH1 SH AH0 S T OW0 N Z/
noun
  1. 1

    Any gem, such as a diamond or ruby, that is expensive because of its rarity or desirability; especially one set into a piece of jewelry.

Source: https://en.wiktionary.org/wiki/precious%20stone, https://en.wiktionary.org/wiki/precious%20stones