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 3:35 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 118 posts ]  Go to page Previous  1 ... 3, 4, 5, 6, 7, 8  Next
Author Message
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Tue Sep 18, 2018 6:38 am 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1047
Location: Paris
What size ? Weight ? Good luck !


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Tue Sep 18, 2018 9:29 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
Flat, windowed....def. not exceptional...

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Tue Sep 18, 2018 9:37 am 
Offline
Gemology Online Veteran
User avatar

Joined: Tue Jan 31, 2006 12:38 pm
Posts: 894
Location: N.J.
Been 24 hours, no response from dealer yet. Someone may have beaten me to it.


Attachments:
Screenshot_20180918-093155_Samsung Internet.jpg
Screenshot_20180918-093155_Samsung Internet.jpg [ 390.37 KiB | Viewed 2716 times ]

_________________
Nick
Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Tue Sep 18, 2018 10:10 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
So sad - such a beautiful stone...

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Tue Sep 18, 2018 10:38 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Tue Jan 31, 2006 12:38 pm
Posts: 894
Location: N.J.
Got stone, should have in a few days.

_________________
Nick


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Tue Sep 18, 2018 11:37 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
=D> Great!! A collector!!

Please post pics..

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Tue Sep 18, 2018 11:50 pm 
Offline
Valued Contributor

Joined: Thu May 28, 2009 4:13 am
Posts: 222
Nicky Newark wrote:
Got stone, should have in a few days.


=D> =D>
Congrats, nice catch.


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Fri Sep 21, 2018 2:30 pm 
Offline
Platinum Member

Joined: Tue Jun 03, 2008 4:40 pm
Posts: 2667
Location: South Dakota
I took these two photos about 2 months ago. The color on both these pieces is phenomenal. I don't know the weight...(didn't mess with taking that info down)... you can tell size reference in the picture. Probably along the order of .06cts-.15cts.... if I had to guess.

Anyone want to try slapping a couple facets on some sub carat sized pieces of these? I'll send you some and we can work out a trade where we split whatever can be polished and or/cut.


Attachments:
cropped.JPG
cropped.JPG [ 951.23 KiB | Viewed 2631 times ]
cropped 3.JPG
cropped 3.JPG [ 1.15 MiB | Viewed 2631 times ]

_________________
MrAmethystguy ~ Some jokes just fluorite over my head!
Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Thu Sep 27, 2018 8:57 pm 
Offline
Valued Contributor

Joined: Thu May 28, 2009 4:13 am
Posts: 222
Did you receive the stone? Are you happy with it?


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Fri Sep 28, 2018 9:43 am 
Offline
Gemology Online Veteran
User avatar

Joined: Tue Jan 31, 2006 12:38 pm
Posts: 894
Location: N.J.
Yes--the stone is very nice. The dealer's photo is very accurate, the one's I took look blurry. I will try again this weekend. I think in cobalt spinel location is pretty important. Next time I'm in Manhattan I'll drop off at AGL for an origin report to verify Vietnam location.


Attachments:
Screenshot_20180925-085411_Samsung Internet.jpg
Screenshot_20180925-085411_Samsung Internet.jpg [ 437.42 KiB | Viewed 2574 times ]
Screenshot_20180925-085226_Samsung Internet.jpg
Screenshot_20180925-085226_Samsung Internet.jpg [ 398.02 KiB | Viewed 2574 times ]

_________________
Nick
Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Fri Sep 28, 2018 1:25 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 4015
Location: North Carolina
It's important because the sri lankan stones don't range into that same electric color (as far as I know ever, certainly not typically). Aside from those two and the specimens from Pakistan does anywhere else even produce cobalt spinel?

_________________
Rough and cut classic and exotic synthetic gems:https://store.turtleshoard.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Fri Sep 28, 2018 3:50 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
Stephen Challener wrote:
It's important because the sri lankan stones don't range into that same electric color (as far as I know ever, certainly not typically). Aside from those two and the specimens from Pakistan does anywhere else even produce cobalt spinel?


Sri Lanka produces the same color but they are extremely rare.
Nomads offered two years ago an incredible fine cushion - 2 ct+...maybe „dioptase“ can post a pic....

A problem are now smaller but fine colored stones like this one

https://www.gemrockauctions.com/auction ... 970-729852

treated spinel (cobalt diffusion) - small, some inclusions but not the ugly large stones formerly known. But could be a challenge to identify.
And synthetic spinel (flux) with identical RI like the natural counterpart are maybe a problem too.

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Fri Sep 28, 2018 8:51 pm 
Offline
Valued Contributor

Joined: Thu May 28, 2009 4:13 am
Posts: 222
Marlow wrote:
Sri Lanka produces the same color but they are extremely rare.
Nomads offered two years ago an incredible fine cushion - 2 ct+...maybe „dioptase“ can post a pic....


Image
This one?
Color wise they are on par with the best Vietnamese material, and certainly they are outliers compared to more "classic" Sri Lankan cobalt spinels with their darker toned blues.

They are really rare, though. Probably even harder to find than the Luc Yen stones.


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Fri Sep 28, 2018 10:43 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
Yes - this one....

Thank you!

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Sat Sep 29, 2018 2:12 am 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 4015
Location: North Carolina
Wow, that is excellent! Would Luc Yen actually command a premium over those? I would guess not but couldn't say for sure.

_________________
Rough and cut classic and exotic synthetic gems:https://store.turtleshoard.com


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 118 posts ]  Go to page Previous  1 ... 3, 4, 5, 6, 7, 8  Next

All times are UTC - 4 hours


Who is online

Users browsing this forum: CurazyJ and 23 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