One-Year Limited Warranty
One-Year Limited Warranty
Warranty Coverage
The90 warrants the Gem, Pendant, and Charger against manufacturing defects in materials and workmanship for one year from the date of original purchase. If a hardware defect arises, The90 will, at its discretion, repair the device or replace it with a functional equivalent.
Warranty Exclusions
This Limited Warranty does not cover:
Accidental Damage: Cracks to the Quartz Glass or metal gouges caused by drops, impact, or misuse.
Environmental Abuse: Damage resulting from submerging the Gem or exposing it to high-pressure water (e.g., diving, water skiing) or extreme heat (e.g., saunas, steam rooms, or hot tubs).
Battery Neglect: Failure caused by "Deep Discharge"—leaving the device at 0% charge for more than 7 consecutive days.
Unauthorized Service: Damage resulting from attempted repairs or modifications by any party other than The90.
Normal Wear: Subtle cosmetic changes to metal finishes or chains over time.
Device Care & Maintenance Guide
Sensor Integrity & Quartz Care
The90 Gem features a precision Quartz Glass face to provide accurate "Skin Intelligence" data.
Clarity: Keep the sensor window clear of thick sunscreens, heavy lotions, or oils. We recommend wiping the face daily with a soft, lint-free cloth.
Handling: Avoid applying excessive direct pressure to the Quartz Glass face to prevent stress fractures.
Water & Temperature Guidelines
Daily Exposure: Your Gem is designed for a life in motion and is safe for rain, showering, and splashing from pools or the ocean.
Post-Swim: Always rinse the Gem with fresh water after exposure to salt or chlorine to prevent mineral buildup.
Thermal Awareness: Metal and glass naturally absorb heat in direct sunlight. If your Gem feels uncomfortably warm against your skin, move to a shaded area or tuck the pendant under a garment for a few minutes.
Battery Health Protocol
To maximize the lifespan of your internal battery:
To prevent permanent battery degradation, do not allow your Gem to sit at 0% charge for more than 1 day.
Low Power Alerts: We recommend docking your Gem as soon as you receive a notification from The90 App.
Storage: If you are not wearing your Gem for an extended period, store it with at least a 50% charge.
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.