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 5:09 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 23 posts ]  Go to page Previous  1, 2
Author Message
 Post subject:
PostPosted: Wed Nov 18, 2009 2:38 am 
Offline
Gold Member

Joined: Thu Apr 17, 2008 1:47 am
Posts: 1350
Location: Pacific Northwest
Looks to me like Andy may have been lurking around for some time now. :wink:

_________________
I just dreamed that I was a butterfly.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Nov 19, 2009 3:16 am 
Offline
Established Member

Joined: Wed Nov 11, 2009 4:22 am
Posts: 26
Location: Windhoek, Namibia
Allen - you are 100% correct. I've been lurking around for a while. But a day came i could no longer hide in shadows. And voila, i'm here, to learn from you - experienced and knowledgeable, and above all polite and patient. Taking your time to explain things to newbies. I should have registered here much earlier, that’s my only regret.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Nov 19, 2009 3:28 am 
Offline
Gold Member

Joined: Thu Apr 17, 2008 1:47 am
Posts: 1350
Location: Pacific Northwest
Yes, I believe that this board is unique in both the level of expertise of the members and in their willingness to share their knowledge. They are not without their sense of humor though and it appears that yours fits in just fine.

_________________
I just dreamed that I was a butterfly.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Nov 19, 2009 7:33 am 
Offline
Gemology Online Veteran

Joined: Mon Dec 01, 2008 6:43 pm
Posts: 615
Location: St. Paul, Minnesota
Has anyone ever proven diffusion in topaz? I thought that was just a rumor?


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Nov 19, 2009 8:23 am 
Offline
Gemology Online Veteran
User avatar

Joined: Tue Dec 05, 2006 6:15 pm
Posts: 746
Location: South Africa
I'm sure it is just that. Don't see any need for it with the wealth of colours already being manufactures through heat, irradiation and coatings for the stuff.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Nov 19, 2009 11:20 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
Oh, no you don't Andy!!!
Save your money and buy yourself a cappuccino.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Nov 19, 2009 11:27 am 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7523
Location: Rome, Italy
Barbra Voltaire wrote:
Save your money and buy yourself a cappuccino.


:lol: :lol: :lol: , maybe more than one...LOL

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
 Post subject: Re: green tourmaline - how do i know i'm getting the real th
PostPosted: Thu Apr 08, 2010 5:55 pm 
Offline
Valued Contributor
User avatar

Joined: Sun Aug 30, 2009 7:55 pm
Posts: 152
Location: Marion, IL, USA
vtrocknut wrote:
How difficult is it to distinguish green tourmaline from any other green transparent stone, assuming the stone is mounted in a ring with metal on all sides (so I don't think specific gravity can be measured)? If the ring were taken to a graduate gemologist, could he/she identify it with 99% certainty?


Without taking the stone out of the ring, it might be possible to see strong dichroism with a London dichroscope or the similar filter built into Dr. Hanneman's synthetic tanzanite filter.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 23 posts ]  Go to page Previous  1, 2

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 7 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