The90 launches Gem pendant, tracks real-time UV exposure

A pendant that looks like jewelry but measures the sun in real time is The90’s bet on the women who want skin protection without wearing a smartwatch. The Gem tracks both UVA and UVB exposure, then turns that feed into personalized guidance on burn risk, sunscreen reapplication, shade, and when to step out of direct light.

The device went on sale June 11, 2026, with an early-access price of $199 before settling at $299. That places it above a simple sunscreen app or a generic UV forecast, but below the kind of premium smart jewelry that tries to justify itself through design alone. The Gem’s case is titanium, its form is a round sensor offered in gold and silver, and its battery is rated at about seven days with a recharge time of roughly two hours. It is also splash-proof and uses Bluetooth Low Energy, the kind of spec sheet that matters for something meant to be worn daily, not tucked away for best.

The real distinction is in the data. The90 says the Gem is designed to measure UV exposure a weather app cannot see, including the light that hits skin while sitting near a sunny window. Its companion app builds a skin profile using factors such as skin type, sunscreen use, and sun-protective habits, then uses live readings from the wearer’s actual environment to shape recommendations. That is a more useful proposition than a broad UV index, especially for people who spend time in cars, offices, or cafes where sunlight slips through glass.

Stacy Salvi, The90’s founder and chief executive, brings a Fitbit pedigree that lends the launch some credibility. She spent eight years at Fitbit, spanning the period before and after Google’s 2021 acquisition, and previously worked at Movano, including on the Evie Ring. Lauryn Bosstick, founder of The Skinny Confidential, is an investor and advisor. The company says its name comes from the claim that as much as 90% of visible skin aging and premature skin damage is tied to cumulative everyday UV exposure, a framing that positions the Gem less as a novelty than as preventive wear.

That is what makes the product interesting. It is not trying to replace sunscreen or turn jewelry into a medical device. It is trying to make protective jewelry feel as normal as a watch, and if The90 can keep the Gem credible beyond launch pricing and startup buzz, it may have a real case for a new everyday category.