Opal Cutting Lapidary Template Cabochon Polishing Tool This is a new lapidary template It is used for calibrating stones into shapes that will fit in standard settings This gauge gives you all of the most popular sizes and makes it easy to draw an exact size without guessing Has a 0 - 10 centimeter scale on the bottom Sizes on gauge: 10 x 8, 11 x 9, 12 x 10, 14 x 10, 14 x 12, 16 x 12, 18 x 13, 20 x 15, 40 x 30, 30 x 22, 25 x 18, 24 x 14, 20 x 12, 16 x 8, 16 x 9, 18 x 9, 22 x 8, 24 x 10, 24 x 10, 7, 8, 9, 10, 12, 14, 16, Dime:18, Dollar: 38, Half Dollar: 30.5, Quarter: 24.2, Nickel: 21, Penny: 19