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

1.
piedra 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.
La corona estaba adornada con muchas hermosas piedras preciosas.
•
She inherited a necklace with a rare precious stone.
Ella heredó un collar con una rara piedra preciosa.