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Identification https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=37&t=15442 |
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Author: | sailorben [ Thu Feb 16, 2012 12:07 pm ] |
Post subject: | Identification |
Have recently started thoughts of gem collecting, and wonder if you are able to ID a piece. It consists of around 40 beads, very clear (at least to the eye anyway) with around 15 sides (???facets???) on each bead. It is colourless, however when moved around in, the light passing through it gives off different colours on each side, they are typically red, orange/yellow, green and possibly blue (if I can remember rightly). Each bead is around 10mm in diameter and the overall weight must be c. 200grams. I do not think it is pleochroic (as these gems tend to favour a certain colour and then 1 or 2 other colours can be seen within, whereas these are purely colourless, but the light passing through gives out many colours on each side). I have been unable to distinguish it using the internet, so any ideas greatly welcome, Ben |
Author: | marcm [ Fri Feb 17, 2012 6:21 am ] |
Post subject: | Re: Identification |
my guess : coated glass (like this : http://image.made-in-china.com/2f0j00yC ... -S093-.jpg ) |
Author: | Alberto [ Fri Feb 17, 2012 7:07 am ] |
Post subject: | Re: Identification |
hi and welcome to the forum sailorben wrote: Have recently started thoughts of gem collecting, and wonder if you are able to ID a piece. i would warn you nothing can be positively identified by seeing a picture...... you would have a clue by providing written infos only? if you'r not able to give us at least some more infos (RI, SG et als) guess we 're loosing time here, sorry..... ciao alberto |
Author: | 75TURBO [ Fri Feb 17, 2012 10:55 am ] |
Post subject: | Re: Identification |
Hi Sailorben, colorless gemstone can not be pleocroic! Wait for a night with a clear visible moon, and check if your stones are birefringent (by using the visual opitcs method). |
Author: | Barbra Voltaire, FGG [ Fri Feb 17, 2012 11:03 am ] |
Post subject: | Re: Identification |
In order to ID something you have to test it, even in the most rudimentary way. If you have no tools, you can start with a laptop screen and a pair of polarized sun glasses. If you suspect glass, touch it to your forehead. Warm or cold? Magnification may reveal fracture surfaces or inclusion which can he helpful. Many things have been previously discussed on the board. Search about a bit. Sidebar, where exactly CAN one learn the visual optics method. There are some sites online which describe it, but someone needs to make a really good tutorial with some videos and post it. hint hint |
Author: | Conny Forsberg [ Fri Feb 17, 2012 12:39 pm ] |
Post subject: | Re: Identification |
I guess pleochroic in the above post actually means dispersion... |
Author: | Barbara O. Ellis [ Fri Feb 17, 2012 1:46 pm ] |
Post subject: | Re: Identification |
Barbra ... No video, but here's where I printed out the instructions (although I still haven't quite got the hang of it ). |
Author: | Bill Hanneman [ Fri Feb 17, 2012 2:44 pm ] |
Post subject: | Re: Identification |
Barbara, Perhaps if you also included consideration of the B:D ratio you might derive more useful information. |
Author: | Barbara O. Ellis [ Fri Feb 17, 2012 3:03 pm ] |
Post subject: | Re: Identification |
Dr. Bill, If I actually sat down and practiced, I'd probably get the hang of it! |
Author: | JB [ Fri Feb 17, 2012 10:42 pm ] |
Post subject: | Re: Identification |
Conny Forsberg wrote: I guess pleochroic in the above post actually means dispersion... I'm thinking iridescence, but who knows... |
Author: | Barbra Voltaire, FGG [ Sat Feb 18, 2012 12:54 am ] |
Post subject: | Re: Identification |
Bill Hanneman wrote: Barbara, Perhaps if you also included consideration of the B:D ratio you might derive more useful information. Fair enough. Start from the beginning, Dr. Hanneman and post a thorough tutorial. The ball is now in YOUR court. |
Author: | Bill Hanneman [ Sat Feb 18, 2012 5:43 pm ] |
Post subject: | Re: Identification |
Barbra Voltaire wrote: Bill Hanneman wrote: Barbara, Perhaps if you also included consideration of the B:D ratio you might derive more useful information. Fair enough. Start from the beginning, Dr. Hanneman and post a thorough tutorial. The ball is now in YOUR court. Indeed it is, and you merit a response. But first, let us look at this from my perspective. As you well know, I have written and sell a book (Guide to Affordable Gemology, $40) in which a full nine pages are devoted to this particular topic. Also, along with my filters, I market a set of plastic cards (Model 2004 - 10 sides, $20) which explains how to practice this technique. Therefore, your request for me to post on your site a "thorough tutorial" on this subject does not initially strike me as something a prudent business man would do. On the other hand, through your forum, I do believe you are performing a very useful service to the field and future of gemology, and you deserve as much encouragement as it is possible to give. Therefore, let me propose the following. I will grant you permission to reproduce the copywrited pages 144-152 from my book as a "tutorial". You, however, will have to translate it into a PDF or whatever to fit your own format. I trust this puts the ball back in your court. |
Author: | Barbra Voltaire, FGG [ Sun Feb 19, 2012 11:08 am ] |
Post subject: | Re: Identification |
I can do that......certainly. I'll format that later today and give it a permanent home for everyone's reference. Excellent. |
Author: | Barbra Voltaire, FGG [ Sun Feb 19, 2012 2:22 pm ] |
Post subject: | Re: Identification |
The pdf of the excerpt from Dr. Hanneman's Guide to Affordable Gemology is available here: Gemstone Recognition Without Instruments: http://gemologyonline.com/hanneman.pdf and in addition an HTML page has been added to our site, listed on the left entitled: Gemstone Recognition Without Instruments, by W.Wm Hanneman In addition: http://www.gemstoneartist.com/GemID.asp |
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