The90 - Gem Personal UV Sensor - Gold

The90 Gem is the first personal sun intelligence system — a jewelry-inspired UV sensor that measures the UVA and UVB exposure you can't see, so you can protect your skin's future in real time.

The removable sensor sits inside a gold titanium pendant and pairs with The90 app over Bluetooth. It tracks both UVA (the rays linked to premature aging) and UVB (the rays that cause sunburn) — including the exposure that quietly adds up through windows, cars, errands, and outdoor workouts.

Using your personal skin profile, genetics, and habits, the app shows your estimated time to burn and tells you exactly when to reapply sunscreen, cover up, or step out of the sun. Splash-proof with up to seven days of monitoring per charge, the Gem is built to wear with your everyday jewelry.

• Measures real-time UVA (aging) and UVB (burning) exposure
• Personalized guidance from your skin profile, genetics, and habits
• Alerts you when to reapply sunscreen, cover up, or get out of the sun
• Captures invisible exposure through windows, cars, and daily errands
• Jewelry-inspired gold titanium pendant; pairs with The90 app
• Splash-proof with up to 7 days of monitoring per charge

At Hewyn, our product selection is guided by a commitment to quality and impact. We collaborate with a trusted network of health professionals who shortlist the latest and most effective items in the wellness space. Each product’s ingredients are rigorously reviewed, ensuring they’re backed by research and offer real health benefits. This process guarantees that every product on Hewyn meets our high standards, delivering only the best for your well-being.