We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board






Newest topics and users posts
18 Mar-08:12:52 Green seam. Looks like it in a state of decay. (Ning)
18 Mar-06:47:13 Mineralogy & museums 10 - cardiff - 12th-13th august 2024 (Roy Starkey)
18 Mar-02:50:32 Re: collection from dany mabillard (Dany Mabillard)
17 Mar-01:57:58 Re: collection of volkmar stingl (Volkmar Stingl)
15 Mar-14:27:47 Re: collection of philippe durand (Philippe Durand)
15 Mar-13:49:04 Re: collection of firmo espinar (Firmo Espinar)
15 Mar-09:18:42 Re: collection of michael shaw (Michael Shaw)
15 Mar-03:45:43 The mizunaka collection - rhodochrosite (Am Mizunaka)
14 Mar-21:29:31 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
14 Mar-14:47:27 Re: collection of philippe durand (Jordi Fabre)
14 Mar-13:56:01 Re: collection of philippe durand (Philippe Durand)
14 Mar-11:24:43 Re: collection of philippe durand (Jordi Fabre)
14 Mar-08:55:22 Re: collection of michael shaw (Michael Shaw)
14 Mar-08:44:47 Re: the mim museum in beirut, lebanon (Mim Museum)
14 Mar-07:24:12 Re: collection of volkmar stingl (Volkmar Stingl)
14 Mar-02:30:15 The mizunaka collection - quartz (Am Mizunaka)
14 Mar-02:20:37 Re: collection of volkmar stingl (Tobi)
13 Mar-23:40:08 Re: collection of volkmar stingl (Volkmar Stingl)
13 Mar-14:22:58 Re: don lum collection (Don Lum)
13 Mar-14:02:43 Re: collection of philippe durand (Philippe Durand)
13 Mar-00:57:48 The mizunaka collection - quartz (Am Mizunaka)
12 Mar-07:36:06 Re: can you recommend a lab to analyse specimens (Luiz Oliveira)
11 Mar-16:19:18 Re: collection of philippe durand (Riccardo Modanesi)
11 Mar-15:18:26 Re: collection of philippe durand (Philippe Durand)
11 Mar-15:13:07 Re: collection of philippe durand (Philippe Durand)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
111632


The time now is Mar 19, 2024 06:00

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Strange glue on the back of a turquoise cabochon
  
  Index -> Off-Topic and Introductions
Like


View previous topic :: View next topic  
Author Message

grm




Joined: 08 Jul 2022
Posts: 7
Location: New York

View user's profile

Send private message

PostPosted: Aug 24, 2022 14:14    Post subject: Strange glue on the back of a turquoise cabochon  

Hello,
I bought a natural turquoise cabochon online, there is some kind of hard glue on the back, does anyone know what it is? The seller said it is a natural glue of the stone but it seems strange to me, it gives me more the impression of something that was used to block the stone and to be able to smooth and mirror it at the top.
How can I do to remove that?
Thanks in advance.



turquoise_glue.jpg
 Description:
 Viewed:  4861 Time(s)

turquoise_glue.jpg


Back to top
Reply to topic Reply with quote
Like
   

Riccardo Modanesi




Joined: 07 Nov 2011
Posts: 618
Location: Milano

View user's profile

Send private message

PostPosted: Aug 24, 2022 14:30    Post subject: Re: Strange glue on the back of a turquoise cabochon  

Hi Grm!
Nothing strange! Ancient jewels lose their stones sometime, because glue doesn't work for ever! It might be a formerly glued cabochon in a jewel, now you have to find the jewel! However the glue is NOT natural.
Greetings from Italy by Riccardo.

_________________
Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
Back to top
Reply to topic Reply with quote
Like
   

grm




Joined: 08 Jul 2022
Posts: 7
Location: New York

View user's profile

Send private message

PostPosted: Aug 24, 2022 15:19    Post subject: Re: Strange glue on the back of a turquoise cabochon  

Riccardo Modanesi wrote:
Hi Grm!
Nothing strange! Ancient jewels lose their stones sometime, because glue doesn't work for ever! It might be a formerly glued cabochon in a jewel, now you have to find the jewel! However the glue is NOT natural.
Greetings from Italy by Riccardo.

Once I had the confirmation that it was not a natural glue of the stone I solved the problem by using cotton swabs soaked in nitro thinner to remove the glue. Thank you for the answer.
Back to top
Reply to topic Reply with quote
Like
   

John Cesar




Joined: 19 Jul 2009
Posts: 37
Location: Tucson, Arizona

View user's profile

Send private message

PostPosted: Aug 24, 2022 19:15    Post subject: Re: Strange glue on the back of a turquoise cabochon  

This is not a glue. Many turquoise stones are backed with material to make the stone look bigger (thicker) than it really is when the bezel is put around the stone and mounted.
_________________
"Tamp 'er light"
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2853
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 24, 2022 23:21    Post subject: Re: Strange glue on the back of a turquoise cabochon  

I think that this "stuff" on the back of the cabochon was what the lapidary used to attach the turquoise to the dop stick for cabbing. Could it be a form of green dop wax?
_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2853
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Aug 24, 2022 23:25    Post subject: Re: Strange glue on the back of a turquoise cabochon  

id est looks like what we used in the cab lab.

There, I'm a poet and don't know it ;-) ;-)

_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Riccardo Modanesi




Joined: 07 Nov 2011
Posts: 618
Location: Milano

View user's profile

Send private message

PostPosted: Aug 25, 2022 04:12    Post subject: Re: Strange glue on the back of a turquoise cabochon  

John Cesar wrote:
This is not a glue. Many turquoise stones are backed with material to make the stone look bigger (thicker) than it really is when the bezel is put around the stone and mounted.



Hi John!
Fully agree: it's not properly a glue, but it is an artificial material used to enhance the stone and make it appear bigger and more beautiful! This method is used not only for turquoise, but for many other gemstones too! The book of Kurt Nassau "Gemstone Enhancement" treats this subject in a very exhaustive way.
Greetings from Italy by Riccardo.

_________________
Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> Off-Topic and Introductions   All times are GMT - 5 Hours
Page 1 of 1
    

 
Jump to:  
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 vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2024


Powered by FMF