Diamond size shape weight conversion

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To determine girdle diameter in mm, use the spreadsheet tool that converts carat weight to best fit lines based on average diamond dimensions found at http://d.neadiamonds.com/diamond-carat. Select the line corresponding to the cut shape of the diamond, such as Asscher, and add a trendline with an equation displayed. Ensure a high R-squared value for accuracy. Note that this is just a rough guide; verify sizes before manufacturing a custom engagement ring or other jewelry. Also, consider using additional calculators like ring metal cost and ring creation script along with the ring size conversion system for better costing and planning.