The Purple-throated Mountain-gem is a hummingbird of wet subtropical forest from Nicaragua through Costa Rica to Panama. Males have a purple throat patch.
It is about 10–11.5 cm long. The male is green overall with a purple gorget; the female has green upperparts and pale rufous underparts.
It inhabits wet subtropical forest. The deep cup nest is made from plant down and other fine materials; breeding is timed mostly with the rainy season.
An extinction-risk assessment has not been added yet.