Comment including the words "I am curious" and I will send you a link to this mandrel created by @grstools and it has equidistant lines which allow you to mark a ring. This is helpful when I want to space out stones or areas I'm going to solder or engrave. I find it helpful. There are many ways to achieve this same result, if you have a different way you measure on a ring send me a tip please! Always happy to share different perspectives :) Tips@metalsmithsociety.com #grstools #ringmandrel #jewelrytools