Buying Coloured Gemstones
Weight Estimation Formulas
If you are unable to weigh the gemstone, the following formulas can be used to estimate the weight:-
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1. Round faceted Stones. |
Diameter x Diameter x Depth x S.G x .0018 |
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2. Oval Faceted Stones (Average out length and width to get Diameter). |
Diameter x Diameter x Depth x S.G x .0020 |
|
3. Emerald-Cut Faceted Stones. |
Length x Width x Depth x S.G x .0025 |
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4. Rectangular-Cut Faceted Stones. |
Length x Width x Depth x S.G x .0026 |
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5. Square Faceted Stones. |
Length x Width x Depth x S.G x .0023 |
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6. Navette or Marquise-shaped Stones. |
Length x Width x Depth x S.G x .0016 |
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7. Pear-shaped or Teardrop-shaped Stones. |
Length x Width x Depth x S.G x .00175 |
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8. Cabochons |
Length x Width x Depth x S.G x .0026 |
