Charlotte Tilbury Patsy Red is a cool red with a semi-matte finish that is permanent and retails for $37.00. In comparison, Guerlain Rouge Saphir (821) is a cool red with a natural finish that is discontinued and retails for $58.00.
Guerlain Rouge Saphir (821) is 85% similar — it is more shimmery, darker, cooler, glossier.