MAC Sand Tropez (Faerie Fayre) is a warm brown with a metallic finish that is limited edition and retails for $20.00. In comparison, Natasha Denona Sienna (50DC) is a warm brown with a sparkle finish that is permanent in palette and retails for $29.00.
Natasha Denona Sienna (50DC) is 85% similar — it is darker, cooler.
