Robert Marc 287 - Diane Keaton - Book Club: The Next Chapter
These are actually her own pair of glasses - she has been spotted with these on several events like premieres and press conferences for other films.
The Robert Marc 287 glasses worn by Diane Keaton have a Tokyo Tortoise frame and clear lenses.
The frame has a signature Robert Mark metal piece on the side of the arms, near the hinge, see photos on the left.
The Robert Marc 287 with tortoise frame is currently hard to find online but there are quite a few on eBay.
Find similar cat-eye, tortoise eyeglasses on Amazon.
The movie Book Club: The Next Chapter is the sequel to The Book Club, and stars Diane Keaton, Jane Fonda, Candice Bergen and Mary Steenburgen, with Craig T. Nelson, Giancarlo Giannini, Andy García, and Don Johnson in supporting roles.
See more eyewear in Book Club: The Next Chapter.
Reference: Robert Marc 287, color 243 Tokyo Tortoise