Folding Four Part Diamond And Gemstone Gauge This gauge is made entirely of aluminum, with 4 leaves, and 2 plain cover leaves Measures: .01 - 2.10 Ct round shape, .06-.40 baguette, and 0.5 -.30 Marquise stones A very handy gauge for the professional jeweler working with gemstones and appraisals This gauge is round shaped, and 1-3/8 inch in diameter An excellent table top or pocket tool- precision made to be accurate every time