The grey-green leaves of Ruschiella argentea grow in opposite pairs. The leaf is thickly succulent, bulging beyond the basic triangular shape. The inner surface sometimes curves back at the tip, meeting the keel top where a tiny mucro often protrudes. Pale surface dots are visible against the light.

New leaves are short and stubby, old ones up to 2 cm long (iNaturalist; https://enjoysucculents.com).