January 24 Through February 4—TUCSON, ARIZONA: Annual show
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Thu Mar 28, 2024 5:16 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject: Ruby filter
PostPosted: Mon Apr 08, 2013 10:55 am 
Offline
Established Member

Joined: Tue Apr 17, 2012 1:39 pm
Posts: 20
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


Attachments:
RubyFil_MED.jpg
RubyFil_MED.jpg [ 42.89 KiB | Viewed 4495 times ]


Last edited by fragile_heart on Tue Apr 09, 2013 1:06 pm, edited 1 time in total.
Top
 Profile  
Reply with quote  
 Post subject: Re: Ruby filter
PostPosted: Mon Apr 08, 2013 1:17 pm 
Offline
Gold Member

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.


Top
 Profile  
Reply with quote  
 Post subject: Re: Ruby filter
PostPosted: Wed Apr 10, 2013 2:36 am 
Offline
Active Member

Joined: Sat May 21, 2011 7:09 am
Posts: 77
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.


Top
 Profile  
Reply with quote  
 Post subject: Re: Ruby filter
PostPosted: Wed Apr 10, 2013 11:47 am 
Offline
Gemology Online Royal Princess

Joined: Mon Oct 17, 2005 10:56 am
Posts: 6461
Location: The frozen north prairie :-/
Would LED be the choice over incandescent for this application? :?:

_________________
IIJA Registered Gemologist
GIA Graduate Gemologist


Top
 Profile  
Reply with quote  
 Post subject: Re: Ruby filter
PostPosted: Wed Apr 10, 2013 3:05 pm 
Offline
Active Member

Joined: Sat May 21, 2011 7:09 am
Posts: 77
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.


Top
 Profile  
Reply with quote  
 Post subject: Re: Ruby filter
PostPosted: Thu Apr 11, 2013 11:41 am 
Offline
Established Member

Joined: Tue Apr 17, 2012 1:39 pm
Posts: 20
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.


Top
 Profile  
Reply with quote  
 Post subject: Re: Ruby filter
PostPosted: Sat Sep 01, 2018 9:05 am 
Offline
New to the Forum or The Quiet Type

Joined: Wed Aug 29, 2018 4:18 pm
Posts: 2
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:


Top
 Profile  
Reply with quote  
 Post subject: Re: Ruby filter
PostPosted: Sat Sep 01, 2018 2:09 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
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.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 6 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock