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`Wt = f( L , W , D ,"Thin-Medium")`

Enter a value for all fields

The **Marquise Brilliant Diamond Weight** calculator computes the approximate weight of a Marquise Brilliant shaped diamond based on the vertical and horizontal widths, the depth and a girdle thickness.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**L**) Length - (
**W**) Width - (
**D**) Depth - (
**GT**) Girdle Thickness Factor: This is a factor of the girdle (middle) of the diamond. Uses the pull-down menu to select the appropriate girdle factor.

**Marquise Brilliant Diamond Carat Weight (Wt):** The calculator returns weight of the diamond in carats. However, this can be automatically converted to other weight units (e.g. grams) via the pull-down menu.

The user must enter a thickness factor for the diamond's girdle ranging from: Slightly Thick,Thick,Very Thick, to Extremely Thick. This is used to calculate the weight correction factor.

The jewelers suite of calculators includes carat weight estimations of diamonds based on the cut diamonds shape and size that can be measured while still within a setting. This enables the jeweler to estimate the carat weigh of the diamond without damaging the setting.

The diamond weight formulas contain carat weight equations that are specific to diamonds and diamond cuts:

- Compute carat weight of Round Brilliant diamond
- Compute carat weight of Oval Brilliant diamond
- Compute carat weight of Heart Shaped diamond
- Compute carat weight of Emerald Cut diamond
- Compute carat weight of Baguette diamond
- Compute carat weight of Princess Cut diamond
- Compute carat weight of Triangular Brilliant diamond
- Compute carat weight of Marquise Brilliant diamond
- Compute carat weight of Pear Shaped Brilliant (Teardrop) diamond
- Compute carat weight of Tapered Baguette diamond
- Compute carat weight of Old European cut diamond
- Compute carat weight of Cushion diamond

The carat weight equations and data used in vCalc's jewelry library and calculator were reviewed by a certified gemologist. The equations are based on industry recognized formulas and data. The table below shows a comparison of computations between vCalc and an industry accepted application (Quantum Leap).

The length, width and depth are in millimeters (mm), and the Quantum Leap and vCalc measurements are in carats (cwt).

The largest variance, an oval faceted alexandrite, which can be seen in the last row above, has been double checked against several source equations which tend to support vCalc's accuracy.