Gemstone Carat Weight Estimation Calculator

Introduction: The Gemstone Carat Weight Estimation Calculator is a helpful tool for jewelers, gemologists, and enthusiasts in estimating the carat weight of a gemstone based on its dimensions. Carat weight is a crucial factor in determining the value and size perception of gemstones.

Formula: The carat weight is estimated using the formula: Carat Weight = (Length * Width * Depth) / 200. This formula provides a rough estimate of the carat weight, assuming a specific density.

How to Use:

  1. Enter the length of the gemstone in millimeters.
  2. Enter the width of the gemstone in millimeters.
  3. Enter the depth of the gemstone in millimeters.
  4. Click the “Calculate” button to obtain the estimated carat weight.

Example: Suppose you have a gemstone with a length of 8 mm, a width of 6 mm, and a depth of 4 mm. After entering these values and clicking “Calculate,” the calculator will provide the estimated carat weight of the gemstone.


  1. Q: Is this calculator suitable for all types of gemstones? A: Yes, it can be used for various gemstones, but the density may vary, affecting the accuracy of the estimate.
  2. Q: How accurate is the estimated carat weight? A: The accuracy depends on the assumption of a specific density. For precise measurements, consult a professional gemologist.
  3. Q: Can I use this calculator for irregularly shaped gemstones? A: The calculator assumes a simple rectangular shape; for irregular shapes, consider an approximation.
  4. Q: What unit of measurement does the calculator use? A: The calculator uses millimeters for length, width, and depth.
  5. Q: Can I use this calculator for diamonds as well? A: Yes, the calculator can be used for diamonds, but keep in mind that diamonds have a specific density different from other gemstones.

Conclusion: The Gemstone Carat Weight Estimation Calculator provides a quick estimate of the carat weight based on gemstone dimensions. While it serves as a useful tool, for precise measurements and valuation, it is recommended to consult with a professional gemologist.

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