I was browsing in the dollar store for stuff to freeze into ice cubes, as I do, and found a bag of party favor rings. They’re made for kids and so can only fit about halfway up my pinky finger, but it’s proof of concept.
To freeze the rings into ice, I used my IceOlogy clear cube tray, which has an open top. I simply put a piece of bamboo skewer across the top of the opening, hanging the ring in the top part of the water.
They came out great. One of the rings was a little deeper into the ice than the other (making it really hard to wear), but that can easily be controlled.
Here are some pics.
For more information about clear ice and my book The Ice Book, check out this page.