Guerlain Blue Ocean is a warm aqua with a pearl finish that is limited edition and retails for $32.00. In comparison, CoverGirl Turquoise Glow (325) is a cool aqua with a frost finish that is limited edition and retails for $4.99.
CoverGirl Turquoise Glow (325) is 90% similar — it is more shimmery, darker, more muted.