MAC A Glimmer of Gold #2 is a warm copper with a frost 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 90% similar — it is more shimmery, darker.