Lethal Cosmetics Sigil is a cool aqua with a metallic finish that is permanent and retails for $6.50. In comparison, Natasha Denona Golden Aquamarine (86P) is a warm aqua with a frost finish that is permanent in palette and retails for $29.00.
Natasha Denona Golden Aquamarine (86P) is 85% similar — it is less shimmery, darker, warmer.