Everything to Know About Susannah Fisher's 2-Carat Diamond Engagement Ring in "The Summer I Turned Pretty"

The season—and series—finale of The Summer I Turned Pretty is scheduled to air tomorrow, September 17, 2025. Ahead of the episode, there are a number of questions fans are grappling with. The biggest one appears to be whether Belly Conklin, played by Lola Tung, and Conrad Fisher, played by Christopher Briney, will ultimately end up together. And if they do end up rekindling their romantic relationship from years prior, some watchers are anticipating a heartfelt proposal between the two.

At the start of the third season, Conrad's brother, Jeremiah, played by Gavin Casalegno, proposes to Belly with a sparkler he purchased himself. The ring features a small diamond, something that fans quickly joked about on social media. On the day of the duo's nuptials, Conrad gives him their late mother's diamond ring, noting that Belly deserves it, but the couple ultimately calls off their wedding. While it's not clear whether Jeremiah kept the diamond or returned it to his brother, many fans believe that the piece is what Conrad will use to propose to Belly at the conclusion of the series.

Here, in anticipation of the series finale, we break down everything to know about Susannah Fisher's engagement ring, as explained by an expert jeweler.

Susannah Fisher's Engagement Ring: Key Details to Know

In the first two seasons of the The Summer I Turned Pretty, while Susannah is often spotted wearing her ring, she doesn't comment on the specific details of the jewel—or the story of her wedding to her husband, Adam. However, based on what we know about the duo's marriage, it's likely that the two tied the knot at some point in the late 1990s or early 2000s, a fact that provides a number of clues about the sparkler. Based on that assumption, the jewel is most likely a natural diamond, says Kegan Fisher, the cofounder of Frank Darling. (Lab-grown jewels didn't gain widespread popularity until the 2010s.) "At the time, a two-carat stone would have been considered quite large for a first engagement ring, since most buyers were in the one to one-and-a-half-carat range." She adds that the jewel was likely considered a high-quality diamond, having a DEF color and at least a VS clarity.

If Adam purchased Susannah's ring in the late 1990s, Fisher notes that the setting is not indicative of the most popular trends of the decade. "The band is extremely thin and the setting feels light—almost CAD-made," she says. "Rings from the '90s tended to be chunkier and more substantial, often wax-carved." She adds that this particular sparkler feels a bit more reminiscent of modern styles, reflecting a shift toward "thinner, diamond-forward designs meant for stacking."

How Much Did Susannah Fisher's Engagement Ring Cost?

Fisher says she estimates Susannah's piece would have cost $20,000 at the time of purchase, equivalent to approximately $35,000 today. That price point makes it 100 times more valuable than the sparkler Jeremiah gave to Belly at the start of season three, which can be purchased for $298 at Catbird, a New York-based jewelry company.