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Lapidary / Gemstone Community Forum
October 20, 2018, 04:15:48 am
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Gemstone ID

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Author Topic: Gemstone ID  (Read 226 times)
zurn
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« on: November 21, 2015, 12:06:07 pm »

I have a refractometer w/a scratched ( measuring glass ,or hemi filter ,  prism )
I've seen a few different names for this piece of polished glass that the gem sits on.
My ? Is is it worth getting it re- finished or polished out

On a slightly different subject would anybody know where to find geodes that have not been split
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trigon
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« Reply #1 on: November 21, 2015, 01:20:33 pm »

It's called a Hemicylinder, and there is an outfit called Denver Gem Cutting, LLC that will polish them out for a pretty tidy sum as I recall. Of course, it's still cheaper than a new refractometer.

Depending on how badly it's scratched, it may still be use-able. Just kind of annoying.

I used to share mine with the gemologists I had on staff under me, so, mine has a nice scratch on it. It's still quite use-able, though.

http://www.gemcutting.com/refractometer.repolishing.gia/index.php

I'm not affiliated with these people and I have no idea how good their work is. I've just done some research for my own benefit.
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zurn
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« Reply #2 on: November 21, 2015, 02:01:31 pm »

Ok Trigone thank you
That's a big help
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gemfeller
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« Reply #3 on: November 21, 2015, 02:06:58 pm »

Depending on how deep the scratches are, sometimes it's possible to polish them out by hand using a cerium oxide/water solution.  I know several people who've had success doing that. 

Proper working techniques can easily avoid scratching.  I've had my Duplex II nearly 40 years with no scratching at all. 

 
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zurn
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« Reply #4 on: November 21, 2015, 06:58:35 pm »

I was looking at the scratch w/ a loop doesn't appear to be to deep but its about half the length
Of the hemicylinder
Ill try to find some cerium oxide
Thanks gemfeller
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