Exclusive | Is a $300 smart necklace the chic secret to preventing skin cancer, sunburns and aging?

My approach to sunscreen has long been simple: If I’m not pink yet, I’ve got time.As a wellness reporter who writes about skin health, I know better.I know the sunscreen rules.

I know the risks.I know that “I’ll just put more on later” is not exactly a sound dermatological strategy.And yet, every summer, I somehow fall into the same trap.

I stay in the sun a little too long, forget to reapply and end up spending the night marinating in aloe.But this year, I’ve had something calling my bluff — before I can get burned.It’s called The90 Gem, a smart necklace that tracks real-time exposure to ultraviolet (UV) light and adjusts its personalized sun-care guidance as conditions change throughout the day.Priced at $299, the device comes in gold or silver and, in my case, easily passed as just another accessory.“I love how wearable technology can make you more connected with your body,” Stacy Salvi, co-founder and CEO of The90, told The Post.

“But I wanted to have something that women could wear as jewelry that nobody would guess is a tracker.”The Gem’s lightweight tech is tucked inside a black charm, where an advanced sensor measures both UVA rays — which contribute to skin aging, including fine lines, wrinkles and hyperpigmentation — and UVB rays, which are the primary cause of sunburns.(Both contribute to skin cancer.)Over time, exposure to both types of UV radiation can increase the risk of melanoma and other skin cancers.“Even without an immediate reaction like a sunburn or tan, the effects of both UVB and UVA are still reaching the skin, impacting the skin at the cellular and molecular level that may not be clinically visible,” said Dr.

Helen He, co-director of Mount Sinai-Clinique Healthy Skin Dermatology Center, who is not affiliated with The90.“These cellular and molecular changes do not develop overnight, but instead accumulate in the skin over years of chronic sun exposure, leading to significantly increased risk of both sk...