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NEWSLETTER |
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Weight Estimation
in Jewellery Settings
Gemstones are used in plenty in jewellery
settings. There are some useful formulas for estimating the
weight of gemstones in settings. These formulas could be used
where the stones cannot be removed for accurate weighing. The
formulas are displayed below for your convienence. These formulas
are calculated for well proportioned stones, however 2% to
6% could be added for bulge factor i.e. excessively steep crown
or pavilion angles. Also remember that the resulting weights
of these formulas are approximate only, accuracy could be achieved
only after correct estimation of bulge factors. |
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Kindly Note:
| 1. |
All weights are given in carats. |
| 2. |
All measurements are given millimeters (mm).3. An asterisk (*) indicates multiplication. |
| 3. |
A Slash (/) indicates division.5. |
| 4. |
S.G. indicates specific gravity (see individual stone descriptions for values or the url). |
Formulas:
1. For round faceted stones:
weight = average diameter * average diameter * total depth * S.G. * .0018
2. For oval faceted stones:
average diameter = (length + width) / 2
weight = average diameter * average diameter * total depth * S.G. * .0020
3. For rectangular faceted stones:
weight = length * width * total depth * S.G. * .0026
4. For square or emerald cut faceted stones:
weight = length * width * total depth * S.G. * .0025
5. For pear shaped or heart shaped faceted stones:
weight = length * width * total depth * S.G. * .0018
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