Natasha Denona Smoky Plum (23P) is a warm plum with a pearl finish that is permanent in palette and retails for $29.00. In comparison, Sephora Seahorse (115) is a warm plum with a sparkle finish that is limited edition and retails for $13.00.
Sephora Seahorse (115) is 90% similar — it is more shimmery.
