Clionadh Azure is a cool duochrome with a metallic finish that is permanent and retails for $15.00. In comparison, Sephora Mermaid Tail (112) is a cool blue with a metallic finish that is limited edition and retails for $13.00.
Sephora Mermaid Tail (112) is 85% similar — it is less shimmery, lighter, cooler.