The Gem (Orthonama obstipata) is a moth of the family Geometridae. It is a common species of Continental Europe and adjacent lands, though in the northeast, its range does not significantly extend beyond the Baltic region and it is absent from northern Russia. This well-flying species is somewhat prone to vagrancy and able to cross considerable distances of open sea; it can thus be regularly found on the British Isles (though mainly in the south) and even on Iceland.