ColourPop Half Light is a warm plum with a glitter finish that is limited edition and retails for $6.00. In comparison, MAC A Medley of Mauves #2 is a warm plum with a metallic finish that is permanent in palette and retails for $21.00.
MAC A Medley of Mauves #2 is 85% similar — it is less shimmery, warmer.