precious stone
US /ˈpreʃ.əs stoʊn/
UK /ˈpreʃ.əs stoʊn/

1.
pedra preciosa, gema
a valuable mineral or rock, such as a diamond, ruby, or emerald, used in jewelry and for other ornamental purposes
:
•
The crown was adorned with many beautiful precious stones.
A coroa era adornada com muitas belas pedras preciosas.
•
She inherited a necklace with a rare precious stone.
Ela herdou um colar com uma rara pedra preciosa.