Urban Decay Big Bang is a cool berry with a glitter finish that is permanent and retails for $19.00. In comparison, Maybelline Amethyst Potion (045) is a cool berry with a pearl finish that is permanent and retails for $8.99.
Maybelline Amethyst Potion (045) is 80% similar — it is less shimmery, more muted, less pigmented.