The only jeweler's chart you'll ever need! Find your conversions all in one place! Jeweler’s At-a-Glance Information We know how often little questions arise as we work at our benches. This chart offers a variety of quick & accessible information to help you keep on working. Rio. For your bench. At your side. Alloy composition chart, temp conversion, solder selection, Mohs hardness, saw blade thickness, and more!