Visa-powered payment ring is now available to everyone (update: separate product) | Engadget
LZW ,NFC Smart Ring Multi-Function Smart Ring Digital Finger Ring for Android Mobile Device Payment Ring Technology Smart Wearable Ring : Amazon.co.uk: Jewellery
World's first NFC payment ring powered by Infineon's contactless security chip - Infineon Technologies
K Ring - The Contactless Payment Ring by K Wearables
Future at Your Fingertips: EVERING Launches Japan's First Smart Ring | Tokyo Weekender
McLEAR Ring contactless payment wearable lets you make secure payments