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#259825 - 08/03/06 06:28 AM Colored Stone Weight Estimation Table
BlueDiamond Offline
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Registered: 03/30/05
Posts: 3241
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

Source: http://www.yourgemologist.com/Charts%20and%20Graphs/coloredgemweights.html

Note: you can incorporate the constants in the diamond estimation table for emerald, pear and marquise to get a better estimate for those here
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#259826 - 08/03/06 08:33 AM Re: Colored Stone Weight Estimation Table [Re: BlueDiamond]
spynena007 Offline
BTD Crown Jewel


Registered: 05/02/03
Posts: 12262
Loc: New York, NY
The x times the thing a ma jig multiplied by... gosh this stuff is hard math was never my strong suit

SPY
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#259827 - 08/03/06 08:36 AM Re: Colored Stone Weight Estimation Table [Re: spynena007]
CaraMish Offline
The Millenium Star


Registered: 11/13/04
Posts: 7850
Loc: Alabama
BlueDiamond, if I were a guy I believe I would ask you to marry me...I'm a closeted science nerd...
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#259828 - 08/03/06 10:34 AM Re: Colored Stone Weight Estimation Table [Re: spynena007]
BlueDiamond Offline
Omniscient


Registered: 03/30/05
Posts: 3241
Quote:

The x times the thing a ma jig multiplied by... gosh this stuff is hard math was never my strong suit

SPY




Now, now, now. Don't get excited . . . it's only arithmetic! Let me know if you need extra help! LOL!
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#259829 - 08/03/06 10:34 AM Re: Colored Stone Weight Estimation Table [Re: CaraMish]
BlueDiamond Offline
Omniscient


Registered: 03/30/05
Posts: 3241
Quote:

BlueDiamond, if I were a guy I believe I would ask you to marry me...I'm a closeted science nerd...




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"Stop taking financial advice from broke people."

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#259830 - 08/03/06 11:52 AM Re: Colored Stone Weight Estimation Table [Re: spynena007]
CaraMish Offline
The Millenium Star


Registered: 11/13/04
Posts: 7850
Loc: Alabama
Quote:

The x times the thing a ma jig multiplied by... gosh this stuff is hard math was never my strong suit

SPY




She's just playing dumb folks...this lady's very likely a Mensa member...
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#259831 - 08/03/06 12:09 PM Re: Colored Stone Weight Estimation Table [Re: CaraMish]
BlueDiamond Offline
Omniscient


Registered: 03/30/05
Posts: 3241
Quote:

Quote:

The x times the thing a ma jig multiplied by... gosh this stuff is hard math was never my strong suit

SPY




She's just playing dumb folks...this lady's very likely a Mensa member...




To be sure!!!
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#259832 - 08/03/06 02:09 PM Re: Colored Stone Weight Estimation Table [Re: BlueDiamond]
DiamondLil Offline
Mentor


Registered: 06/12/04
Posts: 920
Loc: MA
Isn't it easier to just weigh them on one of those little scales?
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#259833 - 08/03/06 02:31 PM Re: Colored Stone Weight Estimation Table [Re: DiamondLil]
BlueDiamond Offline
Omniscient


Registered: 03/30/05
Posts: 3241
Quote:

Isn't it easier to just weigh them on one of those little scales?




It is if you have an appropriate scale, and the stone is unset and you are interested in the weight of the stone, itself, instead of an equivalent [eg CZ to diamond, CZ to sapphire, etc.] in which case you'd have to take the ratio of the specific gravities and then apply it to estimate the weight of the stone you are trying to mimic after you weigh the one you have.
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#259834 - 09/25/06 08:30 PM Re: Colored Stone Weight Estimation Table [Re: BlueDiamond]
gemselect Offline
Curious


Registered: 08/31/06
Posts: 1
For those (like me) who are too lazy to do the arithmetic, this chart of all the calibrated sizes for the standard gem shapes might be helpful -- it shows the weights for each gemtype by size and shape:

calibrated size chart

Happy gem hunting

Ron Nash
GemSelect
Chanthaburi

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