Return & Exchange Policy
30-Day Satisfaction Guarantee
We want you to love your purchase. If it didn’t work out this time, you may return items within 30 days of delivery for a full refund (less original shipping costs, if any). To make a return please email support@the90.com with your order number and someone will get back to you within 1 business day.
Return Eligibility & Condition
To be eligible for a refund, items must be returned in their original condition with all included parts, accessories, and packaging.
The Trial: We encourage you to wear and experience your Gem. For a return to be accepted, the device and jewelry must be fully functional and undamaged, showing no signs of wear beyond what is expected from a standard 30-day trial.
Packaging: Following industry standards for premium electronics, all items must be returned in the original The90 branded packaging.
After the 30-day window has closed, or if a device is damaged by the user within that window, the product is no longer eligible for a refund and falls under our One-Year Limited Warranty.
Frequently asked questions
Is there a subscription or monthly fee?
No. Your Gem comes with the full The90 app and every core feature, with no monthly fee to read your own light. You buy the sensor once.
What does The Gem actually measure?
It reads the UVA and UVB reaching your skin, separately and in real time, then turns the day into a single Sun Score from 0 to 100. Along the way it tracks the light you want, like your morning circadian light and your estimated vitamin D, and the exposure you want to manage, like the UVA that ages your skin.
Do I have to wear it as a necklace?
It comes as a jewelry-grade pendant on a matching gold or silver chain, so you can wear it out of the box. The Gem is also a removable core, so it can move into new ways to wear it as they launch, including a hat clip and bag tag on the way.
How is this different from UVI or weather apps?
The UV Index gives one number for a whole city and says the same thing to everyone. The Gem measures the light actually hitting your skin, separates the aging rays from the higher-energy ones, and reads it against your personal skin profile in real time. It is the difference between a forecast and your actual day
Can I wear it in the water?
Rain, sweat, and a quick rinse are all fine. The Gem is water resistant to 1 meter for 30 minutes, so leave it off for the pool, the shower, hot tubs, and saunas.
What if it is not for me?
Try it for 30 days. If it is not right, send it back for a full refund, and every Gem is covered by a 1-year warranty. Free shipping, dispatched from California within 1 to 2 business days, currently within the US.
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The90™. All Rights Reserved
Medical disclaimer: The90 Gem is not a medical device. It is for informational and educational use only, is not designed to diagnose, treat, cure, or prevent any disease, and does not replace sunscreen or medical advice. Vitamin D is estimated from your light, skin type, and exposure, not measured from blood. Cardiovascular and nitric oxide benefits reference emerging research.