CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: Tutorial on Using a Reftactometer
PostPosted: Fri Feb 24, 2012 12:51 am 
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This tutorial was compiled by Starla Turner, FGA, GG:


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Fri Feb 24, 2012 1:37 am 
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I distinctly remember being told that by moving my head back and up and down I was using the spot method of determining the RI. Can anyone elaborate?

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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Fri Feb 24, 2012 11:06 am 
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I don't understand.


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Fri Feb 24, 2012 4:39 pm 
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It happened here but I went back through my posts and could not find it. Oh well, it is nice to know that I have been doing it right after all. Thanks for posting this tutorial.

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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Fri Feb 24, 2012 4:48 pm 
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No prob, Allen.....and I could be possibly misunderstanding what you mean.
I bob my head all about whenever I'm getting an RI whether a spot or on a flat facet.


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Sat Feb 25, 2012 9:06 pm 
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If a Gemstone is cut at the wrong angles for the type of material or if the gemstone is cut below the critical angle, will this affect the Refractometer reading?

Thanks Harold


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Sun Feb 26, 2012 1:48 am 
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no


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Sun Feb 26, 2012 2:13 am 
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Thanks Barbara

And thank you and Starla Turner for sharing the great tutorials.
I just purchased most of the basic Gemmology hand tools.


Thanks Harold


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Sun Feb 26, 2012 9:22 am 
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Can the size of the stone affect the reliability of a reading?

I would have to assume yes, because I tried to use the sapphire my Gem-A course sent me and gave up, as the tiny drop of RI fluid i used still interfered, I think.

So I used one of my larger ones and got a perfect reading.

Seriously, this thing is tiny, Im guessing 0.1 ct to a max of 0.2

Makes the spectroscope annoying to say the least, and I have the use these to fill out my work book.

Any tips perhaps on getting readings for very small stones, for Refracto and the Spectro? Sorry to bring of the spectrometer btw.


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Sun Feb 26, 2012 11:01 am 
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Small stones can indeed be a challenge with a refractometer. It is not impossible to get a reading, but it is difficult


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Tue Feb 28, 2012 11:43 am 
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Is that a Chelsea filter on her table :smt108 ... or a London dichroscope?

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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Sat May 12, 2012 5:58 am 
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lol I agree that chelsea filter isn't of much use, but it still has a few applications: sorting a batch quickly (gain of time for later identification process), or detecting some dyes (despite it does not detect all kind of dyes)


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Sat May 12, 2012 8:34 am 
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Speaking of a Chelsea, check this out:
viewtopic.php?f=11&t=15937&p=165565#p165565


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Tue Nov 05, 2013 9:52 am 
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Thanks for these videos, they have been very helpful.


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 Post subject: Re: Tutorial on Using a Reftactometer
PostPosted: Thu May 22, 2014 9:42 am 
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Barbra Voltaire wrote:
Small stones can indeed be a challenge with a refractometer. It is not impossible to get a reading, but it is difficult


Indeed!

I think this is my problem at the moment. At what size does a stone begin becoming difficult to determine he RI?

Thanks for your You Tube video on the refractometer, it has been helpful but I am still a ing problems and I did wonder whether the size of the stone was affecting my result. When I did place a large stone on the refractometer the result was very clear.


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