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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