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BLACK DIAMOND OR BLACK MOISSANITE
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=7&t=21369
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Author:  PedroS27 [ Thu Jun 11, 2015 11:47 am ]
Post subject:  BLACK DIAMOND OR BLACK MOISSANITE

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???

Author:  Barbra Voltaire, FGG [ Thu Jun 11, 2015 11:10 pm ]
Post subject:  Re: BLACK DIAMOND OR BLACK MOISSANITE

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

Author:  Robin Winter [ Fri Jun 12, 2015 8:42 am ]
Post subject:  Re: BLACK DIAMOND OR BLACK MOISSANITE

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

Author:  Robin Winter [ Fri Jun 12, 2015 8:54 am ]
Post subject:  Re: BLACK DIAMOND OR BLACK MOISSANITE

Hmm, turns out I was wrong anyway, there's no image of the diamond in the article.

Author:  PedroS27 [ Fri Jun 12, 2015 10:36 am ]
Post subject:  Re: BLACK DIAMOND OR BLACK MOISSANITE

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

Author:  Barbra Voltaire, FGG [ Fri Jun 12, 2015 10:55 am ]
Post subject:  Re: BLACK DIAMOND OR BLACK MOISSANITE

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.

Author:  PedroS27 [ Sun Jun 14, 2015 8:00 am ]
Post subject:  Re: BLACK DIAMOND OR BLACK MOISSANITE

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

Author:  Barbra Voltaire, FGG [ Sun Jun 14, 2015 12:02 pm ]
Post subject:  Re: BLACK DIAMOND OR BLACK MOISSANITE

My pleasure. :D

Author:  Rachelle Carswell [ Tue Mar 12, 2019 10:12 pm ]
Post subject:  Re: BLACK DIAMOND OR BLACK MOISSANITE

Robin Winter... your link was very helpful thank you :D

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