MAC A Glimmer of Gold #3 is a warm copper with a metallic finish that is permanent in palette and retails for $21.00. In comparison, Natasha Denona Atria (107M) is a warm copper with a metallic finish that is permanent in palette and retails for $29.00.
Natasha Denona Atria (107M) is 95% similar — it is more shimmery.
