Becca Aquamarine is a cool duochrome with a luminous finish that is limited edition and retails for $38.00. In comparison, Chanel Miroir d'Eau is a neutral duochrome with a luminous finish that is limited edition and retails for $36.00.
Chanel Miroir d'Eau is 85% similar — it is less shimmery, less pigmented, warmer.