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 Post subject: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Thu Jun 11, 2015 11:47 am 
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Hi, i bought a 4.95 cts black diamond, but im not shore if it's a diamond because the testing machine for moissanite isn't accurate when i test it for black diamonds... Is there any other way to know other than having to sen it to a laboratory???


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 Post subject: Re: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Thu Jun 11, 2015 11:10 pm 
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http://www.gia.edu/gems-gemology/WN13-L ... moissanite

Also, if the stone is loose, Specific Gravity would separate them.
Moissanite SG: 3.22
Diamond SG: 3.5 - 3.53


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 Post subject: Re: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Fri Jun 12, 2015 8:42 am 
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You should in most cases be able to separate them just by looking under a loupe. I suspect the link Barbra shared is the one I'm thinking of and will show you magnified images of both.

Ok, no, I just looked and it wasn't the article I was thinking of. This is the one I was thinking of.

http://stonegrouplabs.com/wp/wp-content ... llenge.pdf


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 Post subject: Re: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Fri Jun 12, 2015 8:54 am 
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Hmm, turns out I was wrong anyway, there's no image of the diamond in the article.


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 Post subject: Re: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Fri Jun 12, 2015 10:36 am 
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It´s not easy... I have a parcel with small black diamonds and when compared with them and the 4.95 cts stone they have different but also same characteristics. Thank´s for your answers


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 Post subject: Re: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Fri Jun 12, 2015 10:55 am 
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Most black diamonds are irradiated, not natural blacks. Hard, even with magnification to separate.

As I said, SG would be definitive.
Rig up a heavy liquid.


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 Post subject: Re: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Sun Jun 14, 2015 8:00 am 
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Barbra Voltaire wrote:
Most black diamonds are irradiated, not natural blacks. Hard, even with magnification to separate.

As I said, SG would be definitive.
Rig up a heavy liquid.


Its a moissanite, 3,20 SG...
Thanks Barbra Voltaire


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 Post subject: Re: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Sun Jun 14, 2015 12:02 pm 
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My pleasure. :D


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 Post subject: Re: BLACK DIAMOND OR BLACK MOISSANITE
PostPosted: Tue Mar 12, 2019 10:12 pm 
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Robin Winter... your link was very helpful thank you :D


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