Julia Roberts wears a pair of Oliver Peoples Cary Grant sunglasses in Ticket To Paradise.
It is a pair of Oliver Peoples Cary Grant Sun OV5413SU-167452 in the color Honey VSB. They have a semi-transparant color frame and the rivets or plaques on the front and sides.
The Oliver Peoples Cary Grant Sun is inspired by the signature style worn by its namesake in the 1959 Hollywood classic North By Northwest.
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You can also find the model on eBay.
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If you're looking for a similar but more affordable style, you could consider the Yesglasses Tanna ($75). You can customize the frame and lens colour!
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Roberts' co-star George Clooney wears Persol PO3246S sunglasses in the same film.
Reference: Oliver Peoples Cary Grant Sun OV5413SU-167452