Jennifer Garner, 54, sparked engagement speculation after sharing an Instagram photo featuring a massive diamond on her ring finger. Jennifer Garner and John Miller Engagement SpeculationAccording to engagement ring expert Nilesh Rakholia, founder of Abelini, Garner’s four to five-carat diamond ring, suspected to be from longtime partner John Miller, has an estimated value of $250,000 — half the value of the engagement ring she was given by ex-husband Ben Affleck, HELLO! After dating for two years, Garner and Miller briefly split in 2020, later getting back together in 2021. Before she married Affleck, Garner was married to actor Scott Foley from 2000 to 2004. “I did marry in my twenties and I found divorce a crushing experience,” Garner shared.