Sleek MakeUP Simbad's Seas is a cool purple with a frost finish that is limited edition and retails for $9.99. In comparison, Natasha Denona Amethyst (141M) is a cool purple with a sparkle finish that is discontinued and retails for $29.00.
Natasha Denona Amethyst (141M) is 85% similar — it is lighter, warmer.