CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: rough diamond
PostPosted: Thu Sep 12, 2019 6:10 pm 
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Any one know of lab or other non natural being sold as natural rough diamonds? Bought one 3 years ago and thinking of getting a few more to set in silver, small, 1ct. or so.
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 Post subject: Re: rough diamond
PostPosted: Fri Sep 13, 2019 12:56 pm 
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I did read, Authenticity of Rough Diamonds, after I posted.

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 Post subject: Re: rough diamond
PostPosted: Fri Sep 13, 2019 10:29 pm 
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Then, I guess you know all synthetic diamonds will be type II.
Type I and type II diamonds can be distinguished by type II’s transparency under short-wave ultraviolet radiation and both types can be definitively separated by infrared spectroscopy or a buddy with an EXA.

Natural diamond xls commercially available for the public are usually a bit ugly.....except for the John Betts specimens. I'd still rather see them in a display case than in jewelry.

Synthetic diamond xls are more uniform:


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 Post subject: Re: rough diamond
PostPosted: Sat Sep 14, 2019 10:46 am 
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There are lots of imitation rough diamonds on the market. However, most are in the diamond fields where small dealers sell them to uneducated buyers trying to get rich.


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 Post subject: Re: rough diamond
PostPosted: Sat Sep 14, 2019 12:26 pm 
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Agreed, I think imitations are far more of an issue than synthetics.


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