CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: Rare gem stone &
PostPosted: Sat Oct 24, 2009 9:58 am 
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Good afternoon
I like to know the way to introduce myself My name is Max Davis and I like to tell other about my new web site
http://1001raregemstones.com
I have a section just for Scientific Equipment
with the latest Gem Refractometer FGR-003

And maybe trade some rare stone with other member of the group
Regards
Max


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PostPosted: Sat Oct 24, 2009 11:27 am 
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Hi Max and welcome to the forum.
I had a look at your refractometer and noticed it had a CZ hemicylindar.

That would be resistant to scratching for sure.

I also noticed (correct me if I am misunderstanding), the RI liquid you were offering had an RI of 1.78.

How does that work with a hemicylindar whose RI should be around 2.176?


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PostPosted: Sat Oct 24, 2009 12:53 pm 
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That is not to bad a site, Max..seems to have some decent info on there..please take the time to hang around and contribute some of your knowledge to the forum..back to your site to read some more :D

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 Post subject: The best refractometer one can find at an affordable price
PostPosted: Sat Oct 24, 2009 2:36 pm 
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To the question of Refractic index Liquid

The is a liquid call Monobromonatherline it is highly inflammable and hard to find. And can only be used by some one that has the right knowledge

Gem Refractometer FGR-003 Hard CZ measuring prism. Scale range: 1.35-1.85.Accuracy: ±0.003 Professional optical design. Aluminum alloy table. Internally installed the monochromatic light. There are two ways of inputting the voltage:7v batteries and DC3V direct current supply(AC100-240V).2ml refringent oil(1.78±0.005) with unique design of the bottle(Proprietary technology ZL200620096730.7),It is much safer ,much economical and more convenient


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PostPosted: Sat Oct 24, 2009 5:23 pm 
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:D welcome to the gemology online forum, max!! looking forward to reading more of your posts on the forum. lol, i have a cat named, "max," he's quite a character!

wow!! i really enjoyed cruisin' around on your website!! nice to see a section for the little ones, too, so parents and grandparents can help them begin a gemstone collection. and...i saw the andradite garnet on your site--very nice!! 8)


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PostPosted: Sat Oct 24, 2009 6:08 pm 
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My question was "what is the refractive index of your liquid?"


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PostPosted: Sat Oct 24, 2009 10:13 pm 
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Ello :smt006

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PostPosted: Mon Nov 30, 2009 8:12 am 
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Hi Max,

Welcome to the forum and congratulations on your great website.
I love your refractometer with CZ measuring prisme and extensive rare gemstones collection.


Lyric


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PostPosted: Mon Nov 30, 2009 11:24 am 
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Lyric, did you buy this refractometer?
If so, what is the RI liquid supplied with it.?

In order to measure gems with an RI higher than 1.80 (plus or minus .01) the RI liquid has to be the same as the RI of the hemicylinder. In the past, the liquids that were available with appropriate RIs (2.15–2.18 for CZ) were far too toxic to be commercially allowable.


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PostPosted: Sat Dec 05, 2009 7:33 pm 
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Quote:
In the past, the liquids that were available with appropriate RIs (2.15–2.18 for CZ) were far too toxic to be commercially allowable.

How much of an actual demand would there be for a safe fluid in that range? How small a niche market is it?

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PostPosted: Sun Dec 06, 2009 1:19 am 
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Gearloose wrote:
How much of an actual demand would there be for a safe fluid in that range? How small a niche market is it?


Why do I hear the faint sound of maniacal cackling? ;)


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PostPosted: Sun Dec 06, 2009 1:21 am 
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gem-n00b wrote:
Gearloose wrote:
How much of an actual demand would there be for a safe fluid in that range? How small a niche market is it?


Why do I hear the faint sound of maniacal cackling? ;)


LOLOL

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PostPosted: Sun Dec 06, 2009 7:45 am 
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Well, I was looking at the state of the Art last night, and some of the fluids proposed for RIs higher than 1.9 are utterly insane...Arsenicals, etc., and suspect the only reason someone has not made a serious effort to do better is economic feasability. In short, is the market size large enogh to support an R&D effort? It appears not to be, or someone would have done it.

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PostPosted: Sun Dec 06, 2009 10:58 am 
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I think that's the point I was trying to make.
There is NO reasonably safe fluid available with a refractive index high enough to make a CZ hemicylindar commercially viable.


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