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Wearable UV Sensor for Skin Health

Own your light.

"I Don't Put My Name On Anything I Don't Fully Believe In."

✦ Lauryn Bosstick, The90 Investor and Creator of the Skinny Confidential.

The first personal sun intelligence system that measures the UV exposure you can't see so you can protect your skin's future in real time.

Personalized to your skin recommendations based on your unique skin profile, genetics, habits, and sensitivities.

Tracks the rays that matter. Measure both UVA (aging) and UVB (burning) in real time – including the exposure that quietly adds up through windows, cars, errands, and more.

Built for everyday life. Wear it with your existing jewelry, pair the Gem with The90 app, and get guidance on when it's time to reapply, cover up, or get out of the sun.

Made to look as good as it performs, The90 Gem blends seamlessly into your everyday jewelry stack.

The jewelry-inspired UV sensor that tracks what your skin actually experiences, so you can protect how you age while harnessing the health benefits of the sun.

Finishes

Track what silently adds up

Monitor UVA exposure (rays linked to premature photoaging and long-term skin damage) even when you can't feel or see it.

Water Resistance

Track what silently adds up

Monitor UVA exposure (rays linked to premature photoaging and long-term skin damage) even when you can't feel or see it.

Accessories

Track what silently adds up

The90 Gem was designed as a timeless piece of jewelry women actually want to wear. Elegant, customizable, and made to fit every moment.

Jewelry Design

Track what silently adds up

Monitor UVA exposure (rays linked to premature photoaging and long-term skin damage) even when you can't feel or see it.

Advanced Sensors

Stop guessing what your skin needs. The90 shows your UV exposure in real time, and tells you what to do about it.

Know your sunburn window

See your estimated time to burn based on real-time UVB exposure (rays that cause sunburn), sunscreen use, and skin profile.

Track what silently adds up

Monitor UVA exposure (rays linked to premature photoaging and long-term skin damage) even when you can't feel or see it.

Build smarter sun habits

See your daily sun exposure patterns, track how your habits add up, and get personalized recommendations on how to protect your skin over time.

Tracks the rays that matter. Measure both UVA (aging) and UVB (burning) in real time – including the exposure that quietly adds up through windows, cars, errands, and more.

Stop guessing your UV exposure.

Own your light

Order Now

Limited units available, pricing only available while supplies last

Meet The Gem

The jewelry-inspired UV sensor that tracks what your skin actually experiences, so you can protect how you age while harnessing the health benefits of the sun.

Meet The Gem

The jewelry-inspired UV sensor that tracks what your skin actually experiences, so you can protect how you age while harnessing the health benefits of the sun.

See What Your Skin Feels

Checking UVI on your phone gives you an idea of the weather, but it doesn’t tell you what you’ve actually been exposed to. The90™ Gem tracks both UVA & UVB exposure in real time and provides insights along the way.

Create your skin profile

The90™ app walks you through a series of questions that help us build your specific skin profile. Genetics, habits, and sensitivities all play a role in how your skin reacts to the sun.

Track UVA & UVB

Know exactly what rays have hit your skin throughout the day, and what that means for your specific skin type. This way you can apply sunscreen or cover up before you burn, and get insights on what you can do to mitigate the aging effects of the sun.

Harness the benefits

We know now more than ever that the sun is vital to our health. With The90™ you can track these benefits like Vitamin D production, so you can maximize the benefits without risking damage from harmful UVA rays.

Create your skin profile
The90™ app walks you through a series of questions that help us build your specific skin profile. Genetics, habits, and sensitivities all play a role in how your skin reacts to the sun.
Create your skin profile
The90™ app walks you through a series of questions that help us build your specific skin profile. Genetics, habits, and sensitivities all play a role in how your skin reacts to the sun.
Create your skin profile
The90™ app walks you through a series of questions that help us build your specific skin profile. Genetics, habits, and sensitivities all play a role in how your skin reacts to the sun.