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question about calculating carat weight

P: 5/7/2003 4:45:07 PM
nycguy Rough Rock Total Posts: 46 Last Post: 8/26/2005 Member Since: 4/26/2002	is there some kind of program or formula that you can input height, width, depth, pav angl, girdle, crown angle, cutlet, and get the carat weight? thanks!
Posted: 5/7/2003 4:45:07 PM

There are 6 replies to this message. There are 6 replies on this page.

P: 5/7/2003 8:11:50 PM
DiamondExpert Ideal Rock Total Posts: 1,243 Last Post: 6/20/2009 Member Since: 1/16/2003	A general formula for SRB's (Standard Round Brilliants) with 58-60% depth and med girdle is: Ct. = height(mm)X diameter(mm)2 X 0.0061. Variations of depth and/or girdle require a 1-5% fudge factor. For the fancy shapes things are a bit more complicated and the formulae are varied depending upon the Length:Width ratios. Gary www.diamondexpert.com
Posted: 5/7/2003 8:11:50 PM

P: 5/8/2003 1:26:28 AM
Garry H (Cut Nut) Ideal Rock Total Posts: 11,567 Last Post: 11/21/2009 Member Since: 8/16/2000	For most smaller round brilliants you can use lxwxd x .00625. The most accurate system is DiamCalc for all shapes and variations etc. Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au
Posted: 5/8/2003 1:26:28 AM

P: 5/8/2003 12:53:45 PM
alice123 Rough Rock Total Posts: 3 Last Post: 5/8/2003 Member Since: 5/7/2003	great, thats helpful. does that formula only really hold true for very well cut stones or is it consistently accurate regardless of angle variation etc? thanks!
Posted: 5/8/2003 12:53:45 PM

P: 5/8/2003 2:43:57 PM
Garry H (Cut Nut) Ideal Rock Total Posts: 11,567 Last Post: 11/21/2009 Member Since: 8/16/2000	It is reasonable for a wide range, it includes a factor for average girdles which are thicker than on well cut stones. Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au
Posted: 5/8/2003 2:43:57 PM

P: 5/8/2003 5:21:56 PM
DancinGirl Cut Rock Total Posts: 424 Last Post: 10/4/2005 Member Since: 2/24/2003	Hey I never knew this little trick! Very cool! I just tried mine and it came out to be a 1.10 - and mine is a 1.07... not too bad of a difference there! ~~ Dancin Girl ~~ "I get up ~ I walk ~ I fall down. Meanwhile, I keep dancing."
Posted: 5/8/2003 5:21:56 PM

P: 5/8/2003 6:57:43 PM
Garry H (Cut Nut) Ideal Rock Total Posts: 11,567 Last Post: 11/21/2009 Member Since: 8/16/2000	Yes DG It will give a higher weight for most stones over 1/2 ct. Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au
Posted: 5/8/2003 6:57:43 PM

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