Charlotte Tilbury Scarlet Spell is a cool red with a satin finish that is limited edition 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 80% similar — it is more shimmery, lighter, cooler, glossier.