The White-throated Mountain-gem lives in Costa Rican mountain forest. The adult description notes a white throat, pale green breast, and grayish tail.
The adult has a white throat with a few blue-violet feathers along its edge, a pale green breast, and a grayish tail.
It is found in steep wooded terrain and the canopy, and may descend to shrubs at forest openings and in secondary growth. In Costa Rica it is reported in high-elevation Talamanca oak forest.
The nest is a deep, compact cup of fine plant fibres and tree-fern scales, decorated outside with moss and small pieces of lichen.
An extinction-risk assessment has not been added yet.