I was inspired to make a ring for NFC and RFID from the modern rogue video when they got an RFID tag in their hand but I don't have the money to put one in my hand so I made a ring with two tags.

Tags

NFC https://www.amazon.com/gp/product/B01EQLSDIY/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

NFC and RFID https://www.adafruit.com/product/2800

STEP 1: PRINT | STEP 2: Put the tags in the slots | STEP 3: GLUE TOGETHER | STEP 4: Sand smooth

NOTES
It's in three parts so you could have a multi-color ring
I Don't know anything about the ring size and its very hard to change the size in tinkercad for me but you can just change the STL to your liking.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/e8DncG5GByw