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»  » Diamond Prices and Grading »
 » Colored Stones
»  » Weight of sapphire (corundum)
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Weight of sapphire (corundum) |
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| P: 2/14/2007 12:39:09 PM | |
Cyren Rough Rock Total Posts: 38 Last Post: 7/12/2008 Member Since: 6/5/2006 |
Hoping someone can answer this for me: are diamond and sapphire (corundum) similar is density? Thus, for the same carat weight, are diamonds and sapphires similarly sized? “Spread” after cutting aside, are the rocks going to equal each other? The question is academic, as most people will look at both carat weight and spread when choosing any gem, but I’m curious. Thanks!
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| Posted: 2/14/2007 12:39:09 PM | |
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There are 5 replies to this message. There are 5 replies on this page. |
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| P: 2/14/2007 12:50:22 PM | |
Dee*Jay Ideal Rock Total Posts: 6,491 Last Post: 9/23/2009 Member Since: 3/26/2006 |
Sapphires are about 30% denser than diamonds so a sapphire of the same ct weight will be about 2/3 the size of a diamond of the same ct weight (all other things being equal).
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| Posted: 2/14/2007 12:50:22 PM | |
| P: 2/14/2007 1:02:32 PM | |
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Cyren Rough Rock Total Posts: 38 Last Post: 7/12/2008 Member Since: 6/5/2006 |
Thanks DeeJay. I remember someone mentioning this on the board in passing, but I wanted a definitive explaination.
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| Posted: 2/14/2007 1:02:32 PM | |
| P: 2/14/2007 3:32:07 PM | |
colorchange Cut Rock Total Posts: 255 Last Post: 6/13/2007 Member Since: 6/8/2005 |
Date: 2/14/2007 12:50:22 PM Author: Dee*Jay Sapphires are about 30% denser than diamonds so a sapphire of the same ct weight will be about 2/3 the size of a diamond of the same ct weight (all other things being equal). Beeing a bit more accurate: Sapphire density is 4, diamond is 3.52. sapphire is only 14% more dense. So a 3.52 Ct diamons and a 4 Ct sapphire of same cut (which is very unusual) would make the same size. A sapphire of 3.52 Ct would be (3.52/4)^(1/3) that is 4.2% smaller if you consider diameter for instance. If the diamond is 9 mm, the sapphire will be 8.6 mm. If you consider face surface (what we perceive as size), sapphre will be 8.2% smaller. Since refractive index of sapphire is lower, a diamond cut sapphire has to be deeper. And sapphire is almost never cut that way. |
| Posted: 2/14/2007 3:32:07 PM | |
| P: 2/14/2007 3:46:19 PM | |
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Dee*Jay Ideal Rock Total Posts: 6,491 Last Post: 9/23/2009 Member Since: 3/26/2006 |
Colorchange, thanks for giving better info! I don't know where I got 30% from; my apologies for misleading you Cyren.
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| Posted: 2/14/2007 3:46:19 PM | |
| P: 2/15/2007 1:20:44 AM | |
Richard Sherwood Ideal Rock Total Posts: 4,879 Last Post: 11/23/2009 Member Since: 9/25/2002 |
Although it is only 14% denser than diamond (as Colorchange points out), in actuality a sapphire of the same millimeter measurement will usually weigh 30% more than a diamond, sometimes as much as 40% (as DeeJay points out). This is because of the difference in cutting between sapphire and diamond. Diamond is much more precision cut, while sapphire has usually thicker girdles, larger "bulge" factor, etc. Rich, Independent GG Appraiser |
| Posted: 2/15/2007 1:20:44 AM | |
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