Pat McGrath Amethyst Astral is a cool lavender with a sparkle finish that is permanent and retails for $36.00. In comparison, Dior Diorstellaire (595) is a cool lavender with a pearl finish that is permanent and retails for $37.00.
Dior Diorstellaire (595) is 85% similar — it is less shimmery, more pigmented, warmer.