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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Sun Feb 18, 2018 5:07 pm 
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Just ordered a matched pair of small rounds. Supposed to be top color- will see when they arrive. :D

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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Sat Feb 24, 2018 8:28 pm 
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Just louped both spinels. Very nice clean,well cut, medium neon blue stones. At 2mm.very tiny. Not much out there.

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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Sat Feb 24, 2018 11:04 pm 
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Pics?? I am obsessed with these :D


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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Sun Feb 25, 2018 3:15 am 
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Yes, I want to see them too!

In the last month I got three cobalt spinel from Vietnam from Geir Atle (Baldergems)

A bit lighter oval with 0,54 ct and a similar colored 0,25 ct with fine cutting and clarity - I love this color very much - brighter than the top neon color ( the little one) , maybe a bit paraibish...

The 0,68 ct has a strong color shift to violett - sometimes a "sapphire", sometimes a "tanzanite" or "amethyst".

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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Sun Feb 25, 2018 7:34 pm 
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Cell phone photo, not so good.


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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Sun Feb 25, 2018 7:46 pm 
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Same stones, another lousy picture.


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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Sun Feb 25, 2018 8:08 pm 
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A little better, but still not what the eye sees.


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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Wed Feb 28, 2018 7:01 pm 
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One of the stones I got in the "matching" set, that I had received a little while back, which shows the color you imagine and expect to see with the mentioning of these particular type of Cobalt spinel from Vietnam.
The second Co spinel gem, sure doesn't hold to the same level of color intensity, lack of tone, and crisp blue hue, as the one I mentioned first.
I am only posting the one with the nice electric-like blue color, and none of the other stone...fyi.

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I dug out some of the rough stones I had with as close to same color as the gemstone, in the picture below
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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Thu Mar 01, 2018 10:51 am 
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Thanks for all the eye candy!! Nick, are yours that electric blue that you were expecting? I have a couple tiny ones but I wouldn’t describe them as electric, and they certainly don’t look like Jason’s. One of mine shifts pretty strongly to violet too. Jason does your electric one shift at all?


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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Thu Mar 01, 2018 6:52 pm 
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http://www.ssef.ch/fileadmin/Documents/ ... E21-Bd.pdf

page 14

The neon cobalt spinels ( light-medium to medium) have a much higher cobalt and to my experience no color shift.

The ones with a lower cobalt content ( light-medium up to deep blue) shift...

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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Thu Mar 01, 2018 8:45 pm 
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The pic I posted above of the cut stone with the rough pieces, is the good one out of the two I procured.
The pieces of rough around the gemstone in the picture above, were the best colored ones I could find out of the 60-70 pieces I got in the last parcel, and whatever pieces I had squirreled away from the first batch.
Those 60-70pcs. were already high graded for best color, or as close to it as one could get, per my request for purchasing.
even though not all were that amazing color you look for, a good portion of them were.

I just took a baggie with around 10 good blue colored ones in it, and I held them in the last light of the setting sun just now, and 3 out of those 10, didn't shift at all towards the red end of the spectrum. They were all small, glassy crystals, with great color, those that shifted and those that didn't.
When I held the next batch up to the light, which was from my first small parcel of these I bought, and which contained the biggest pieces I have, each of them shifted some, or so it seemed. There is 8 or 9 stones in that batch, and each is a fantastic blue, yet all of them shifted to some degree.

The stones above that I posted, look fake in that photograph, ya know. Exactly like the old school Brazilian Paraiba tourmalines looked like, when the good color onbes were around.
I used my new Olympus to shoot the pics, and didn't alter or enhance the color in anyway.
The light I used was the 5500K photo bulb, which is for overall lighting, alongside the 6200K bulb for close-up shots and for specific light shots.
Like Paraiba tourmaline, I think the real true neon/electric color, comes out only after the stone is cut/cabbed/etc., and light then has a way of getting inside to brighten the stone up.

You can see this happening on some rough pieces that retain the glassy crystals faces left over from formation, which is why I try to position the pieces at the best angles for catching light and giving them a rich blue hue, when I snap pics.
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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Fri Mar 02, 2018 3:42 am 
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Color shift here means from blue to violet in incandescent light or - I agree - the warmer sunlight in the evening ( sundown ).

Hat there is some variation of color is o.k. but the top material i still vivid blue in incandescent light.

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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Fri Mar 02, 2018 12:59 pm 
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dstojan wrote:
Thanks for all the eye candy!! Nick, are yours that electric blue that you were expecting? I have a couple tiny ones but I wouldn’t describe them as electric, and they certainly don’t look like Jason’s. One of mine shifts pretty strongly to violet too. Jason does your electric one shift at all?

They are close in color to the color shift stone on page 14 of the Face tte magazine.(Marlow's download). Not the hauyne color I was hoping for. Still a couple nice stones at a reasonable price.

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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Mon Sep 17, 2018 7:24 pm 
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Trying to claim this almost unheard of Luc Yen cobalt that is clean, well cut and top color. I put in request as soon as I received the listing. This dealer goes by who's email he gets first. Waiting to hear ( yes he is a G.O. member). If something did beat me I hope it's one of our members. I have been looking a long time, this is an exceptional stone.


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 Post subject: Re: Luc Yen cobalt blue spinel.
PostPosted: Tue Sep 18, 2018 1:28 am 
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yes I saw the stone too. Nice size and price. Go for it!

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