Gem Cut Yield Calculator
Estimate expected polished gemstone weight from rough stone weight, shape, and target cut.
Inputs
ct
Results
Polished Weight
1.95 ct
Yield39%
Weight Loss3.05 ct
Loss61%
Rough ShapeOctahedron
Target CutRound Brilliant
SawingYes - saw to maximize yield
How to Use This Calculator
- Enter the Rough Weight in carats and select the Rough Shape (octahedron, macle, irregular, crystal fragment).
- Select the Target Cut (round brilliant, oval, emerald cut, pear, or cushion).
- Select the Inclusion Level (clean, minor, or significant inclusions).
- Review the estimated Yield Percentage and Polished Weight in carats from the rough.
- Use the yield to calculate minimum rough value needed for profitable cutting.
How the result changes with Rough Weight
| Rough Weight | Polished Weight |
|---|---|
| 100 | 39 ct |
| 350 | 136.5 ct |
| 650 | 253.5 ct |
| 900 | 351 ct |
What each input means
- Rough Weight
- Weight of the rough stone in carats
- Rough Shape
- Shape of the rough stone
- Target Cut
- Desired polished shape
- Inclusion Level
- Level of inclusions that may need to be cut away
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersRough Weight = 5, Rough Shape = 0, Target Cut = 0, Inclusion Level = 1 = 4 input(s) provided
- Calculate Polished WeightPolished Weight1.95 = 1.95
- Calculate YieldYield = baseYield39 = 39
- Calculate Weight LossWeight Loss3.05 = 3.05
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