Aryna Sabalenka's 12-Carat Oval Diamond Engagement Ring, All the Details

Aryna Sabalenka had been dropping hints for months. At a tournament earlier this year, the world's top-ranked women's singles player looked out at the crowd and said, almost casually, "Thank you to my boyfriend...Hopefully soon I can call you something else." On March 3, 2026, Georgios Frangulis made it official: a poolside proposal surrounded by dozens of candles and floral arrangements, and a ring that had been in the making for far longer than the surprise suggested.

Sabalenka posted the news on Instagram with characteristic directness: "I can finally call him something else…FIANCÉ 💍." In a reel she shared showing aspects of the design process, she laughed at her own casual outfit during what turned out to be a momentous occasion: "Well guys, everything happened, but just look how I look." Frangulis, for his part, responded on camera: "Pretty as fuck."

The ring, though, was anything but casual.

The Center Stone

At the heart of the piece sits an oval-cut diamond weighing over 12 carats, set in platinum. The oval shape is doing considerable work here: its elongated silhouette maximizes surface area, amplifying the stone's brilliance and giving it a commanding presence on the hand. Oval diamonds have dominated the celebrity engagement ring conversation for several years now, but this particular stone pushes well beyond the standard solitaire template.

No color or clarity grade has been confirmed by the designer or the couple's representatives, and no certification details have been made public. What is clear is the scale: every outlet covering the ring, from Town & Country to InStyle to trade publication Instoremag, consistently reports the center stone at approximately 12 carats, with some specifying "over 12 carats." The exact decimal weight, and whether the diamond is natural or lab-grown, remain unconfirmed, which matters considerably when it comes to valuation.

The Setting and Band

The platinum mounting is more architecturally interesting than the stone's scale alone might suggest. The band features a cathedral setting that curves slightly inward toward the center stone, set with micro-pavé diamonds along the shank. Pamela Catlett, chief brand officer at Brilliant Earth, described the effect as having "a sculptural precision that feels both architectural and fluid." It is a construction choice that draws the eye upward toward the oval without competing with it: the pavé line creates movement rather than bulk.

The shank's inward curve is notably distinct from the more common straight or slightly tapered bands that typically accompany large oval solitaires. Instoremag called the design "unusual," noting specifically that the inward arc creates a sculptural quality that aligns with the broader rise of architectural fine jewelry.

The Emerald Secret

The most striking detail on this ring is one you would not see looking at it straight on. The gallery, the area beneath the center diamond and between the prongs, is covered in vibrant green emeralds. Instoremag described it plainly: "The gallery of the ring holds a surprise as well: it's covered in vibrant green emeralds, the tennis star's favorite colored gemstone."

This was Frangulis's idea, not a default flourish. As Town & Country reported, he specifically asked designer Isabela Grutman to incorporate emeralds because they are Sabalenka's favorite stone. The result is a hidden detail that only the wearer and those close to her would notice day-to-day: a private language built into the architecture of the ring. Grutman described the emeralds as "a personal touch that makes the ring uniquely hers."

It is worth noting that questions remain about the emeralds' specifications, including whether they are natural, their total carat weight, and how they are set within the gallery. These details have not been confirmed through the designer's public communications or a press release.

The Designer: Isabela Grutman of ISA Grutman Jewelry

The ring was commissioned by Frangulis and executed by Isabela Grutman, CEO and founder of ISA Grutman Jewelry (Instagram: @isagrutmanjewelry). Grutman is described across coverage as a friend of Sabalenka's as well as her jeweler, a dynamic that clearly informed the intimacy of the design choices.

"I've always admired their love and relationship, so I was incredibly flattered when Georgios asked me to design this piece," Grutman said in a statement shared with Town & Country. "We spent months working on the design, selecting the stones, and perfecting every detail of the craftsmanship to make it truly special for Aryna." On the stone itself, she was direct: "This stone is perfect for her."

Sabalenka, for her part, responded to the designer's Instagram post with equal warmth: "So talented and special you are," she wrote, adding a red heart emoji and "love you."

The months-long process reflects the complexity of sourcing a center stone at this scale and integrating a secondary gemstone into a hidden architectural detail. Commissioning a ring of this nature typically involves evaluating multiple candidate diamonds before selecting one, then designing a mounting that can accommodate both the stone's proportions and whatever personal elements the client wants to incorporate.

What Experts Say It's Worth

Because the diamond's origin (natural versus lab-grown) has not been publicly confirmed, any valuation is necessarily conditional. That said, two independent experts provided estimates based on the reported specifications.

Pamela Catlett of Brilliant Earth placed the high end of value clearly: "A natural stone of this size and quality could be valued at $1 million." Kristy Cullinane of Plum Diamonds offered a more granular breakdown, telling Page Six that the ring is worth "$750,000+ for a natural diamond or around $25,000 if it's a lab-grown diamond."

The gap between those two figures illustrates exactly why provenance matters in fine jewelry. A natural 12-carat oval diamond of high quality is extraordinarily rare; lab-grown diamonds of this size, while visually identical, are produced in controlled environments and carry a fraction of the market price. Neither expert confirmed which scenario applies here. Until the designer or the couple discloses whether the stone is natural and provides grading documentation, the valuation range spans five figures to seven.

Design in Context

The ring lands at the intersection of several converging trends in fine jewelry. Oval center stones have been the preferred shape for high-profile engagement rings for several years, favored for their vintage-adjacent silhouette and the way they flatter the finger. The sculptural, curved shank speaks to a growing appetite for engagement rings that function more like art objects than status symbols. And the hidden emerald gallery reflects a shift toward personalization: details that carry meaning for the wearer rather than simply signaling value to the room.

What makes Sabalenka's ring distinct within that context is the restraint of the personalization. The emeralds are not visible from the front. The pavé is delicate rather than statement-making. The ring leads with the oval diamond and allows every other element to exist in service of it, and of the story behind it.

Sabalenka is next competing at the Indian Wells Tournament in Palm Springs, which began shortly after the engagement was announced. She is bringing a new title with her.