Ultrahuman Rare is meant to be a luxury, artisan-crafted smart ring. The platinum version costs $2,200.

That remains to be seen, but the Apple Watch has already broken ground when it comes to premium wearables. And Ultrahuman’s smart rings don’t require a subscription to access the main tracking ...

Oura remains the king of the smart ring business – at least until Apple enters the arena – but two competitors are trying very different approaches in launching their own models. French branch ...