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Author Topic: Gemstone size vs. well cut diamonds  (Read 410 times)
Snooper
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« on: February 06, 2008, 01:31:30 PM »
Say David, I have a question... Say you have a 1 carat well cut round sapphire and a 1 carat well cut RB.  In general, the sapphire will be smaller than the diamond right? It seems like this is true looking at gemstone mm vs. diamonds.

Curious...

 david

What got me thinking is if people put gemstones in the halo jackets you have vs. diamonds. 
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Awestruck
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« Reply #1 on: February 06, 2008, 01:38:11 PM »
Yep Snoop
My RB diamond studs are .77 tcwt and my sapphire studs are .78 tcwt but the sapphires are in fact smaller than the diamonds.
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Awestruck
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« Reply #2 on: February 06, 2008, 01:48:38 PM »
If you look back to the post I did showing my jackets, you`ll see both studs, sapphire and the diamonds. There is quite a size difference i think.
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acebruin
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« Reply #3 on: February 06, 2008, 02:21:36 PM »
maybe because the sapphire is cut deeper to have more color...  traps more light...  where as the RB the cut reflects more light, shallower...  just a guess...
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Diamondsbylauren
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« Reply #4 on: February 06, 2008, 02:28:53 PM »
Hi guys!

The cutting style of sapphires is entirely different than the cutting style of diamonds.  They are also different in their specific gravity.  In other words, a piece of sapphires exactly the same size and dimension as a diamond  not weigh the same thing.
Don't ask me which one weighs more, but they are different. 

So there's differences in cutting, and differences in density.  It's smarter to use millimeter size when trying to fit jackets
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oldmancoyote
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« Reply #5 on: March 19, 2008, 06:31:10 PM »
OK, first post by the most anally retentive member of this group (how do I know? I just do  Evil)

Just out of interest:

Diamond density: 3.52 (assuming "pure" diamond, i.e. just carbon)
Sapphire density: 3.98 (again, assuming relatively pure corundum + a little bit of titanium and/or iron - most likely artificial)

Sooo... to have the same weight, a diamond has to be about 5% bigger in each dimension(w x h x d) than a sapphire with the same proportions. Add to this that usually colored gemstones are cut deeper than diamonds, and voila. Same size to the eye, and much more weight.
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Awestruck
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« Reply #6 on: March 19, 2008, 06:50:55 PM »
Hi Coyote
Welcome !
Interesting info thanks.
Lynne
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djm195
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« Reply #7 on: March 19, 2008, 07:24:15 PM »
Quote from: oldmancoyote on March 19, 2008, 06:31:10 PM
OK, first post by the most anally retentive member of this group (how do I know? I just do  Evil)

... and voila. Same size to the eye, and much more weight.

Yup, I think you are right on both counts...but you are in good company!
( I know, I know--its the pot calling the kettle black... Roll Eyes)

Welcome coyote--glad to have you here!!
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titania
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« Reply #8 on: March 20, 2008, 09:11:27 AM »
Welcome, Coyote and thanks for the very factual information!
Titania
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