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Tutorial on Using a Reftactometer
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=37&t=15491
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Author:  Barbra Voltaire, FGG [ Fri Feb 24, 2012 12:51 am ]
Post subject:  Tutorial on Using a Reftactometer

This tutorial was compiled by Starla Turner, FGA, GG:

Author:  allen [ Fri Feb 24, 2012 1:37 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

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?

Author:  Barbra Voltaire, FGG [ Fri Feb 24, 2012 11:06 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

I don't understand.

Author:  allen [ Fri Feb 24, 2012 4:39 pm ]
Post subject:  Re: Tutorial on Using a Reftactometer

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.

Author:  Barbra Voltaire, FGG [ Fri Feb 24, 2012 4:48 pm ]
Post subject:  Re: Tutorial on Using a Reftactometer

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.

Author:  HHelton [ Sat Feb 25, 2012 9:06 pm ]
Post subject:  Re: Tutorial on Using a Reftactometer

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

Author:  Barbra Voltaire, FGG [ Sun Feb 26, 2012 1:48 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

no

Author:  HHelton [ Sun Feb 26, 2012 2:13 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

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

Author:  Kaltgoulash [ Sun Feb 26, 2012 9:22 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

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.

Author:  Barbra Voltaire, FGG [ Sun Feb 26, 2012 11:01 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

Small stones can indeed be a challenge with a refractometer. It is not impossible to get a reading, but it is difficult

Author:  Barbara O. Ellis [ Tue Feb 28, 2012 11:43 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

Is that a Chelsea filter on her table :smt108 ... or a London dichroscope?

Author:  cascaillou [ Sat May 12, 2012 5:58 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

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)

Author:  Barbra Voltaire, FGG [ Sat May 12, 2012 8:34 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

Speaking of a Chelsea, check this out:
viewtopic.php?f=11&t=15937&p=165565#p165565

Author:  vhram [ Tue Nov 05, 2013 9:52 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

Thanks for these videos, they have been very helpful.

Author:  Gem 14 [ Thu May 22, 2014 9:42 am ]
Post subject:  Re: Tutorial on Using a Reftactometer

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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