Buy with confidence.
Free shipping. 30-day returns. 1-year warranty. No subscription required. Real humans answer your questions.
Shipping
United States
Free standard shipping on all orders. Expedited and overnight at checkout. Ships in 1–2 business days from California. Tracking email on fulfillment. U.S. shipping only at launch.
Returns
30 days. No drama.
Try The Gem for 30 days from arrival. If it’s not for you, send it back. We’ll cover return shipping in the U.S. and refund your card within 5 business days of receiving it.
Within 30 days of delivery
Working condition (cosmetic wear from use is fine)
Original packaging appreciated, not required
Warranty
Covered for a year.
1-year warranty against manufacturing defects. If the sensor stops working, the battery fails, or the housing cracks under normal use, we’ll repair or replace it free.
Not covered: lost or stolen Gems, drop damage beyond reasonable wear, water damage beyond rating, modifications or unauthorized repairs.
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 the UV Index or my weather app?
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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