Sydney Grace Slayed is a cool gray with a metallic finish that is permanent and retails for $6.25. In comparison, NARS L'Amour, Toujours L'Amour #9 is a cool gray with a pearl finish that is discontinued and retails for $25.00.
NARS L'Amour, Toujours L'Amour #9 is 90% similar — it is less shimmery, lighter, cooler.