Smart Jewelry Tracks UV Exposure and Gives Personalized Skin Protection Advice

The90 has recently launched The Gem, a wearable piece of jewelry that monitors UV exposure in real time while also serving as a fashion accessory. The company says it is designed to give users a precise, personal way to reduce cumulative sun damage, instead of relying on broad estimates.

Unlike weather apps that show only general radiation levels for an area, The Gem uses sensors that measure ultraviolet radiation in the user’s immediate surroundings. That lets it detect hidden exposure, including through windows, inside cars, and during routine daily activity. Data is sent to a dedicated app that analyzes exposure and tells users when to reapply sunscreen, when to avoid more sun, and how everyday habits affect skin health over time.

The system takes into account personal factors such as skin type, genetic sensitivity, and lifestyle habits. It focuses on UVB, which causes sunburn, and UVA, which is linked to premature skin aging. The company says combining real-time readings with a personal profile helps users move from guesswork to more accurate sun management.

Dr. Richard Weller, a dermatology and UV radiation specialist, serves as the company’s chief medical officer. The product also has support from entrepreneur Lauren Bostic, who is associated with The Skinny Confidential and promotes preventive skin-care and wellness. The90 says its approach stands out in a market that already has UV-monitoring products, because it combines a stylish jewelry design with deeper personalization and “sun intelligence.” The company cites data showing that about 90% of visible signs of aging are caused by UV exposure. The Gem is now available for preorder for about $199, with first deliveries expected in June.