Adria Arjona wears Tiffany diamond necklace at Supergirl fan event

Adria Arjona gave the Supergirl fan event at Cineworld Leicester Square a lesson in controlled drama. She arrived in a red Roberto Cavalli dress styled by Dani Michelle, then anchored the look with Tiffany & Co.’s Bird on a Rock Wings pavé necklace, a 16-inch platinum chain set with diamonds and listed at 7.56 carats total weight. Worn close to the throat, the necklace kept the eye centered on the gown’s plunging neckline and lace-up bodice rather than competing with them.

That balance is what made the styling work. In a season where red carpet jewelry can easily tip into excess, Arjona chose a single fine necklace with enough brilliance to register from across the carpet but enough restraint to preserve the line of the dress. The result was not minimalism for its own sake; it was precision. The diamond pavé added light without clutter, and the short length gave the Roberto Cavalli silhouette room to breathe.

The appearance took place on June 18, 2026, in London, and it carried a distinctly public, family-forward charge as well. Jason Momoa attended with Arjona and his children, Nakoa-Wolf Momoa, 17, and Lola Iolani Momoa, 18, as the group posed together and shared a kiss on the blue carpet. Momoa is set to play Lobo in Supergirl, while Milly Alcock stars as Kara Zor-El, giving the event a sense of cast chemistry and off-screen intimacy that extended beyond the film itself.

The necklace itself carries the weight of Tiffany history. Bird on a Rock by Tiffany is an homage to Jean Schlumberger’s celebrated brooch, first introduced in 1965, and the modern collection was conceived by Chief Artistic Officer Nathalie Verdeille. That lineage matters here because the piece does more than sparkle: it translates a house signature into something sleeker and more contemporary, with the kind of close-fitting profile that works best when the clothing already has architectural force.

Arjona’s turn is a strong argument for 2026 evening dressing at its most assured. One sculptural necklace, chosen with exacting scale, can do more than a stack of jewels or a louder statement piece ever could. When the dress brings the theatrics, the right diamond line simply finishes the sentence.