The Jo-Di Gauge can be used with all popular shapes of diamonds - without removing the stone from the mounting!
A favorite diamond weight estimator for many years, the Jo-Di Gauge can be used with all popular shapes of diamonds without removing the stone from the mounting. This is the only millimeter caliper gauge that "reads" round, emerald, pear and marquise-shaped diamonds. The unit is made of anodized black aluminum, with easy-to-read numbers and large-type tables. This set comes with gauge, reference book, and case.