The90 Gem – While many wearables chase AI features, The90 is betting on something simpler: a pendant necklace with a built-in UV sensor that tracks UVA and UVB exposure throughout the day and turns it into personalized guidance through a mobile app.
The sun has a way of slipping into the day unnoticed—through car windows. office blinds. and quick errands that feel too short to matter. For people who worry about skin aging or sun damage, that “it wasn’t that much” time adds up. The90 is trying to change the math with a pendant-style necklace designed to measure UV exposure in real time.
The company has created The90 Gem. a necklace with a built-in UV sensor that works with a mobile app to track how much UVA and UVB radiation a person’s skin is actually getting as the day goes on. Instead of pushing constant notifications or flashy features. the device is built around one core idea: if you can see the exposure more clearly. you can make smarter choices about protection.
The company ties its approach to a specific claim about risk. The90 says up to 90% of visible skin aging and premature skin damage is linked to cumulative, everyday UV exposure. In its framing. UVA rays are associated with long-term skin aging and can pass through windows. while UVB rays are more closely connected to sunburn—making both types relevant even when someone isn’t spending hours outdoors.
Inside the app, The90 Gem feeds live UVA and UVB data so users can build a personal skin profile. The app is designed to take into account skin type, sunscreen use, and sun-protective habits, then offer more tailored guidance based on those inputs.
That guidance is where The90 Gem is meant to feel practical. The company says the wearable can provide personalized UV thresholds. sunscreen reapplication reminders. and safer sunlight exposure windows using real-time conditions—aimed at helping users decide when to reapply sunscreen and how to time daily exposure more carefully.
The design also leans into normal life. The90 Gem is built as modular smart jewelry, styled to be worn like a regular pendant. The company claims up to seven days of battery life, a two-hour charging time, and splash resistance, while also advising users not to fully submerge the necklace.
Pricing puts it squarely in the “intentional purchase” category for wearable tech. The90 Gem is available now for $299, with an exclusive $199 early access offer available through its website. It comes in gold and silver colors.
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So it just tracks UV through car windows?? like then it’s basically spying on my skin all day.
I’m not paying $300 for a necklace to tell me to wear sunscreen. If people can’t figure that out on their own then idk.
Wait, I thought UVA and UVB are the same thing? Like one is for tanning and one is for burning right? The article made it sound like it tracks both separately and somehow it knows your skin profile?? seems kinda overhyped to me.
Visible skin aging being “90%” from UV exposure sounds like marketing math. Also it says it turns into guidance but isn’t the guidance just “reapply sunscreen” lol. Car windows though… I swear I saw somewhere that UVB doesn’t get through those, so how would this thing help me if it’s counting everything? Not trying to hate, just skeptical.