Knowing the size of a rhinestone, jewel, or even an area you are trying to feel is important. Guessing a stone size is not a good strategy. A jewelry gauge is an essential tool for any rhinestone or jewelry professional. This is a pocket size sliding measuring tool that can precisely measure in both millimeters (centimeters) and inches.
The 80mm gauge measures from 0 to 80mm (o to 3 3/4 inches). You can measure on both sizes, rhinestones, beads, flat back or sew on stones, pearls, settings, findings and various components. It is made of brass, making it durable.
Leave the guess work behind, have a caliper gauge in your tool box.