GeoGems International Diamond Sales Vancouver, Canada
GeoGems International Diamond Sales Vancouver, Canada GeoGems International Diamond Sales Vancouver, Canada GeoGems International Diamond Sales Vancouver, Canada GeoGems International Diamond Sales Vancouver, Canada
GeoGems International Diamond Sales Vancouver, Canada

Buying Coloured Gemstones

Weight Estimation Formulas

If you are unable to weigh the gemstone, the following formulas can be used to estimate the weight:-

1. Round faceted Stones.

Diameter x Diameter x Depth x S.G x .0018

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

4. Rectangular-Cut Faceted Stones.

Length x Width x Depth x S.G x .0026

5. Square Faceted Stones.

Length x Width x Depth x S.G x .0023

6. Navette or Marquise-shaped Stones.

Length x Width x Depth x S.G x .0016

7. Pear-shaped or Teardrop-shaped Stones.

Length x Width x Depth x S.G x .00175

8. Cabochons

Length x Width x Depth x S.G x .0026
(.0029 for very flat)


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