These charts will give you pre-calculated carat to mm conversions, as well as recommended length-to-width ratios, depth percentages, table percentages and more. Radiant Cut Diamond Size Chart (MM) The ideal ratio for a Radiant cut diamond produces a slightly rectangular shape. You'll be able to find details on the ideal proportions for a given diamond shape and carat weight, and check that the dimensions of the stone are adequate to make sure it looks as brilliant as possible. Its standard width is 3.37 inches (3 38 inches), or 85.6 mm (8 centimeters, 56 millimeters) for the metric measurement. Since we also talked about imperial screw callouts, let’s read this screw thread callout as well: 6 x 1 x 1/2. We’ve got 4 different mm ruler printables. You can also calibrate the on-screen ruler using a bank payment card. The third and final number is the screw’s length which equals 30 mm. The second number is the screw’s pitch which equals 1.25 mm. To help you find the perfect diamond for your needs, we used AI to analyze millions of diamonds and created a diamond shape guide for each of the most popular diamond cuts. The first number after the letter M is the screw diameter which equals 3 mm. 5/16 head times two equals 10, minus two equals 8. Gauge (Head diameter in sixteenths of an inch X 2 ) 2. Our printable rulers are actual size so if you’re looking for a metric ruler of 12-Inch or 30 centimeters then this is what you need. Use the formula below to estimate the screw head and gauge.
Find Add Comparisonĭiamond size charts are very useful for gemologists and jewelers, but also for anyone who wants to compare the size of a specific diamond shape across different carat weights. The imperial diameter (in 16 th of an inch) of the screw head is usually twice the gauge (imperial). We'll use the ideal measurement for any blank values based on the carat and type of diamond. * The length, width and depth are in millimeters and are optional.