Both plant and blooms of this Mexican species are tiny. But the details on the succulent foliage and vibrantly colored flowers are worth grabbing a jewellers loupe to appreciate them.
Domingoa gemma would be technically correct, but does not indicate which variety of the species you have. Domingoa angustifolia is probably a better way to label it. (it's listed as a heterotypic synonym of Domingoa gemma, which means that it's a recognized variety of the species.)