Billie Eilish and Finneas designed a John Hardy jewelry line — from $195

Billie Eilish and Finneas have spent this fall in what Eilish calls “serious album mode.” This week the siblings stepped outside music for a different kind of drop: a co-designed jewelry collection with John Hardy, out today and priced from $195 to $2,400.

The line — called simply the Billie Eilish and Finneas Collection — is sustainably minded, made from reclaimed sterling silver and lab-grown diamonds. It splits into two moods. Wildflower borrows its name from a hit Eilish song and favors dainty floral pendants, earrings, bracelets and rings for everyday wear. Screwball goes harder, with sculptural chain links and spherical hardware meant to be layered and mixed.

Billie and Finneas each have their own incredibly strong sense of personal style. Both were willing to go against type.

The duo worked with John Hardy creative chairman Reed Krakoff, after first partnering with the label last year as the faces of its JH Lovestruck collection. This year there was “no pressure” to design pieces of their own, Eilish says, but the timing felt right.

Tested on stage, then added to the set list

Eilish road-tested the jewelry during tour, having pieces sent out to wear while performing. “I wanted something that felt like it had a presence, but wasn’t hurting my neck while I was jumping around, or getting stuck on stuff,” she says. Finneas favors the Wildflower rings: “The petals on the rings are very satisfying.”

Eilish’s favorite detail is an earring with no backing — “a long, dainty soft chain with a cute little flower at the end” that can thread through the ear or just dangle. Both say they were already wearing finished pieces on stage before the launch, and the designs are not designed to read like merchandise. “It’s not merchandise, per se,” Finneas explains. “We wanted to make objects that are just appealing on their own.”

Music hasn’t stopped for the launch. “We’re in serious album mode right now,” Eilish adds. “We’ve been making a lot of music, and just hanging out with each other and our dogs.”