Sydney Grace Vibrant Madness is a warm brown with a metallic finish that is discontinued and retails for $8.00. In comparison, Natasha Denona Sienna (50M) is a warm brown with a metallic finish that is permanent and retails for $29.00.
Natasha Denona Sienna (50M) is 85% similar — it is less shimmery, darker, cooler.
