Digital jewelry is fashion jewelry with embedded intelligence and components like displays, microphones, and antennas. A presentation proposed digital jewelry concepts like earrings containing speakers, a necklace with a microphone, and a bracelet or ring with a small display. Prototypes from IBM included a magic decoder ring with LEDs to indicate calls and a mouse-ring using trackpoint technology. Digital jewelry could integrate functions of devices like IDs and payment cards but has challenges with size, cost, and power limitations.