You must have a way to measure stones. Without it, you cannot order stones correctly. If you can give any stone supplier your measurement in millimeters (accomplished with the gauge) then they can covert it to stone size or pearl plate to find your stone. In the jewelry making world, for some reason most everything is measured in millimeters. See below, I made a special video some time ago to help you learn to do it. With this tool, the video and a few minutes of your time, you can get on to this so fast! And you will be really glad you did, it's truly something you need to put in your bag of jewelry making tricks!