CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sat Aug 17, 2019 10:54 am 
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Pardon if this is a novice question, but might anyone know if the IIDGR Diamond View is currently the only machine used by labs & gemologists for separating natural type II diamonds from type II lab-grown diamonds? (*Assuming that a stone-in-question has already undergone testing by machines such as the GIA id100 or the HRD J-Screen with a refer result given, and all imitations like CZ and moissanite are already ruled out)

Would testing using the IIDGR Diamond View as it is now (the updated version w/ filters) be the only (or) best next step to take in the process, if one wanted to take the identification further? Is there a newer machine that could replace it soon via the same or similar technology / methods? Thanks very much in advance for any insights on this, just curious mostly. :)


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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sat Aug 17, 2019 1:21 pm 
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I'm sorry.
Where did you get the information that this instrument is the "only" one used by labs and gemologists?
I don't think that is true.


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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sun Aug 18, 2019 3:49 am 
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Apologies, I was just told by a colleague that it was the only "next step" instrument that labs use for separating type 2 diamonds after using the GIA id100 (or HRD J-Screen). So.. I was informed that these two instruments refer a small amount of natural diamonds- around 2%, and these would then be checked using the DiamondView.

I wasn't sure about this, which is exactly why I posted the question on this thread, looking to ask if there were any other instruments (newer or otherwise) capable of further identifying this 2%. :)


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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sat Sep 14, 2019 3:46 am 
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when a type II completely lacks N3 and other features which can allow its identification as a natural diamond, the ultimate weapon is fluorescence imaging under Deep UV. the most common unit for this purpose is the diamondview.
as a sidenote i would stress that many natural IIa do contain enough N3 not showing up in absorption UV-VisNIR but that can be identified by appropriate instrumentation, only the extremely pure ones really need to undergo the growth structure observation in deep UV.

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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Wed Oct 23, 2019 12:34 pm 
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Thank you for the helpful information Alberto! I didn't know that some natural IIa do contain N3 defect.

May I ask a bit further- for these particular stones you mentioned that have N3, but where N3 will not show up in absorption when using a UV-VisNIR, what appropriate instrumentation would I need to obtain in order to actually see these? I'd very much like to acquire one if there are any cheaper than the DiamondView.

Again, much appreciation for the insight! :D


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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Wed Oct 23, 2019 2:46 pm 
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You are welcome.
N3 in those stones can show up in fluorescence spectroscopy with an adequate source. This unit works: https://hrdantwerp.com/en/equipment/detail/j-screen

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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Wed Oct 23, 2019 3:08 pm 
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I will verify what Alberto has said. I purchased this unit.


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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Wed Oct 23, 2019 3:17 pm 
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Everytime you stumble on a blue fluorescing IIa you can be sure to find N3 in it... :wink:

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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sat Oct 26, 2019 12:10 am 
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Thanks guys, much appreciated! :) By the way, also on another note- would you happen to know any alternative fluorescence microscopy instrument (aside from the DiamondView)? just for checking the small percentage of stones that get referred by the J-screen?


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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sat Oct 26, 2019 11:51 am 
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Nothing on the market sofar, and an alternative product, if it will exist, would not be so different....

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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sat Oct 26, 2019 1:04 pm 
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I wonder how hard it would be to set up a normal fluorescence microscope to work for this use. Presumably you just need the right light source and filters. Probably not really cheaper though...

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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sat Oct 26, 2019 1:19 pm 
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Believe me it's not gonna be cheap AT ALL...

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 Post subject: Re: Regarding the (2015) IIDGR DiamondView (w/ filters)
PostPosted: Sat Oct 26, 2019 2:04 pm 
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Is it more the filters or the light source? Or the high-sensitivity camera?

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