Jane Seymour confirms engagement to John Zambetti with custom Brilliant Earth ring

Jane Seymour’s engagement ring is the kind of custom piece that gets read quickly and remembered longer: a 4.04-carat radiant diamond set in platinum, with marquise diamonds framing the center stone above and below. The design, created by Brilliant Earth, lands in the sweet spot many shoppers are chasing now, where a clean center stone is given just enough architecture to feel personal without losing clarity.

Seymour confirmed the engagement to John Zambetti on June 11 during the Songwriters Hall of Fame induction ceremony at the Marriott Marquis Hotel in New York City, turning a private piece of jewelry into a public debut. The ring had already fueled speculation a day earlier, when Seymour appeared on TODAY with Jenna & Sheinelle wearing a diamond on that finger and speaking coyly about her relationship.

The couple had been together for three years, after beginning to date in 2023. Seymour went Instagram official with Zambetti in October 2023 and said at the time that she had “never been happier.” The engagement followed a proposal Seymour described as unusual and comedic, with one account saying the pair were not wearing clothes when Zambetti asked.

What makes the ring notable is not just its carat weight, but its balance of polish and ornament. A radiant cut brings crisp geometry and strong light return, while marquise side stones add length and movement without crowding the center. That combination is a sharp alternative to the plain solitaire and a more restrained path than a fully haloed ring, which helps explain why custom settings like this keep drawing attention from buyers who want a recognizable shape with a private signature.

The story also has a musical through line. Seymour said music is central to their household, and the family already has multiple singer-songwriters in the mix: Zambetti, his son Johnny Zambetti, and Seymour’s son Johnny Keach. Zambetti also brings an unusual second life to the story, since medical directories list him as an emergency medicine physician in Burbank, California, with 51 years of experience and training from New York Medical College. In a season of oversized headlines and recycled styles, Seymour’s ring stands out because its details feel chosen, not assembled.