NARS Private Eye is a warm plum with a metallic finish that is limited edition and retails for $19.00. In comparison, Chanel Pourpre Brun (58) is a warm plum with a semi-matte finish that is limited edition and retails for $30.00.
Chanel Pourpre Brun (58) is 90% similar — it is less shimmery, darker, cooler.