Dior So Real - Tilda Swinton - A Bigger Splash
Dior So Real sunglasses are available in different color combinations, and have a different color painted on the top part of the lenses, see the product photo on the left. That's not a refelection on the lens, that's actually a different color (although it is a bit transparent so it doesn't block your view). It can be seen in the screenshot from the film as well if you look closely.
Reference: Dior So Real black, B0YMD