Colored Gemstone Weight Estimation Tables from YourGemologist.com

Colored Gems Weight Estimation Tables

To obtain approximate weights of the following shapes of colored stones multiply by the following measurements to millimeters. A listing of the specific gravities is below.

Round Faceted = ................Diameter x diameter x depth x SG x .0018

Oval Faceted = ...................Diameter x diameter x depth x SG x .0020

Emerald Faceted = ..............Length x width x depth x SG x .0025

Rectangle Faceted = ............Length x width x depth x SG x .0026

Square Faceted = ................Length x width x depth x SG x .0025

Marquise Faceted = ............Length x width x depth x SG x .0017

Pear Faceted = ....................Length x width x depth x SG x .0018

Heart Faceted = ...................Length x width x depth x SG x .0018

Table of Specific Gravities for Popular Gemstones

Zircon: ......4.32 - 4.70	Diamond: ...........3.52	Conch Pearl: ........2.85
Almandite Garnet: 4.05	Peridot: ...............3.34	Turquoise: .............2.76
Ruby: ..........4.00	Jadeite: ................3.34	Lapis Lazuli: ..........2.75
Sapphire: .....4.00	Zoisite (tanzanite) ..3.35	Beryl Group: ..........2.72
Malachite: ....3.95	Diopside: .............3.29	Pearl: .....................2.70
Rhodolite Garnet: 3.84	Spodumene: .........3.18	Quartz: ...................2.66
Pyrope Garnet: .....3.78	Andalusite: ...........3.17	Coral: .....................2.65
Chrysoberyl: ........3.73	Tourmaline: ..........3.06	Iolite: .....................2.61
Spinel: ..................3.60	Nephrite: ...............2.95	Opal: .....................2.15

For more information, please visit the International School of Gemology website

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