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

The Contrast Club brand uses the energy from a tiny nudge or touch to make earrings curl up or a bracelet wrap around the wrist.

In the Dune and Desert Rose variants, you’ll get 18-karat gold, while the Desert Snow version ... Unlike a typical piece of jewelry, like a good old-fashioned ring, a smart ring generally ...