Giorgio Armani Halo (2) is a warm taupe with a metallic finish that is permanent and retails for $36.00. In comparison, Natasha Denona Glam (321M) is a warm taupe with a sparkle finish that is permanent in palette and retails for $29.00.
Natasha Denona Glam (321M) is 80% similar — it is less shimmery, lighter, cooler.