New Mineral Named After GIA’s John Koivula
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 Post subject: Ruby filter
PostPosted: Mon Apr 08, 2013 10:55 am 
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Joined: Tue Apr 17, 2012 1:39 pm
Posts: 19
Good Evening

I need info about ruby filter , is it useful to identifly
ruby faceted stones or rough stones ?

thank u very much

Irfan

Italy


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Last edited by fragile_heart on Tue Apr 09, 2013 1:06 pm, edited 1 time in total.
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 Post subject: Re: Ruby filter
PostPosted: Mon Apr 08, 2013 1:17 pm 
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Joined: Mon May 14, 2007 11:00 am
Posts: 1133
Location: Monterey, CA
fragile_heart wrote:
[b]Good Evening

I need info about ruby filter , is it useful to identifly
ruby faceted stones or rough stones ?



Both, it doesn't care what condition it is. :D

There are at least two types of Ruby Filters- Red and Green.

I have no idea what a red filter does.
The Hanneman Ruby filter is green and gives a blue color for ruby.


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 Post subject: Re: Ruby filter
PostPosted: Wed Apr 10, 2013 2:36 am 
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Joined: Sat May 21, 2011 7:09 am
Posts: 74
Location: Italy
Hi, I have one like your (red filter).

I post here my experience.

1) put the ruby on a black surface (if faceted, table down);
2) spot the gem with a led white light (reflected light);
3) observe the ruby from about 30 cm distance, using the filter as a lens
(near the eye).

Result: the ruby bright red: other red gemstones, like garnets or spinels,
become dark (black).
Ruby filter is a easy way the separate ruby from other gemstones in a gem
lot.

I find also that this ruby filter is a band pass filter for the band 680-730
nm (red region) of the visible light: it was tested with an incandescent lamp
and my spectroscope.


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 Post subject: Re: Ruby filter
PostPosted: Wed Apr 10, 2013 11:47 am 
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Joined: Mon Oct 17, 2005 10:56 am
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Location: The frozen north prairie :-/
Would LED be the choice over incandescent for this application? :?:

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 Post subject: Re: Ruby filter
PostPosted: Wed Apr 10, 2013 3:05 pm 
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Joined: Sat May 21, 2011 7:09 am
Posts: 74
Location: Italy
Hi Barbara,
yes, the white led light is my choice.

Incandescent light has an high percentage of power in the red region, while the white led is more on the blue region.

I have try both, of course, some types and powers, on different gemstones/minerals, but I have better results with led white light.


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 Post subject: Re: Ruby filter
PostPosted: Thu Apr 11, 2013 11:41 am 
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Joined: Tue Apr 17, 2012 1:39 pm
Posts: 19
75TURBO wrote:
Hi, I have one like your (red filter).

I post here my experience.

1) put the ruby on a black surface (if faceted, table down);
2) spot the gem with a led white light (reflected light);
3) observe the ruby from about 30 cm distance, using the filter as a lens
(near the eye).

Result: the ruby bright red: other red gemstones, like garnets or spinels,
become dark (black).
Ruby filter is a easy way the separate ruby from other gemstones in a gem
lot.

I find also that this ruby filter is a band pass filter for the band 680-730
nm (red region) of the visible light: it was tested with an incandescent lamp
and my spectroscope.


Thank u very much 75Turbo
U are very nice person.


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 Post subject: Re: Ruby filter
PostPosted: Sat Sep 01, 2018 9:05 am 
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75TURBO wrote:
Result: the ruby bright red: other red gemstones, like garnets or spinels,
become dark (black).
Ruby filter is a easy way the separate ruby from other gemstones in a gem lot.
I

I have a lot glass imitations of ruby.
They give the same reaction under the filter. :shock:


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 Post subject: Re: Ruby filter
PostPosted: Sat Sep 01, 2018 2:09 pm 
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Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19854
Location: San Francisco
That has always been my point with filters.
They are not reliable to identify what something is....just possibly, what it is not.


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