January 24 Through February 4—TUCSON, ARIZONA: Annual show
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 Post subject: Dichromatic (not dichroic) blue YAG
PostPosted: Sun Jan 22, 2017 1:55 pm 
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Hey folks! I have an interesting synthetic find that I'll be bringing to Tucson. It's a giant slab of blue-purple YAG, obviously not Nd:YAG, that was grown in Russia by the horizontal floating zone method. It also happens to be dichromatic. Thinner pieces are obviously violet, but thicker pieces are rich blue with a hint of green. And it's not a zoning issue either - I checked.

Just wanted to share.


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Sun Jan 22, 2017 3:12 pm 
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Cool! Yet another reason not to miss the GO dinner!

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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Sun Jan 22, 2017 4:00 pm 
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:cry: don't forget pictures... [-o<


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Sun Jan 22, 2017 4:32 pm 
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I'm stuck up in Alaska I was actually hoping to make the show this year but won't be able to make it

If you're selling any of it any chance you could put some in the marketplace?


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Mon Jan 23, 2017 4:13 pm 
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Faceting 101 by Arya wrote:
Thinner pieces are obviously violet, but thicker pieces are rich blue with a hint of green.


Seems like the usambara effect, but at the other end of the color spectrum, with material that transmits more violet than blue, while the eye is more sensitive to blue than violet. Cool.


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Mon Jan 23, 2017 8:06 pm 
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Brian wrote:
Seems like the usambara effect, but at the other end of the color spectrum, with material that transmits more violet than blue, while the eye is more sensitive to blue than violet. Cool.

Yup it's basically the Usambara effect, but instead of green => red, it's violet => blue.


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Mon Jan 23, 2017 11:32 pm 
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Arya, can you get me a sample? Just let me know $.


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 Post subject: Faceting 101 by Arya
PostPosted: Tue Jan 24, 2017 8:03 am 
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Barbra Voltaire wrote:
Arya, can you get me a sample? Just let me know $.

Sure, I'll saw it up a bit more and bring some to Tucson.


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Tue Jan 24, 2017 3:59 pm 
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I won't be making it to Tucson this year. Fractured patella.


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Tue Jan 24, 2017 7:44 pm 
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Barbra Voltaire wrote:
I won't be making it to Tucson this year. Fractured patella.



Sorry to hear that, I hope your recovery goes well.


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Tue Jan 24, 2017 8:23 pm 
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A) So, on further testing, it also has a colour shift. Usambara effect, AND colour shift. Interesting.

B) Shoot sorry Barbra, I forgot :( I'll mail you a piece once I saw it up. Wasn't really planning on selling any - were you just interested to see and/or test it, or did you want a piece for yourself?


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Tue Jan 24, 2017 9:07 pm 
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All of the above. I'd love to have a piece for my collection.
I've always been captivated by the Usambara effect.
For anyone needing a bit more information:
http://www.nordskip.com/usambara.html


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Wed Jan 25, 2017 7:33 pm 
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Faceting 101 by Arya wrote:
A) So, on further testing, it also has a colour shift. Usambara effect, AND colour shift. Interesting.

B) Shoot sorry Barbra, I forgot :( I'll mail you a piece once I saw it up. Wasn't really planning on selling any - were you just interested to see and/or test it, or did you want a piece for yourself?



any chance for pictures? It sounds like very interesting stuff. If you cut any can youtell us how it polishes?


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Wed Jan 25, 2017 8:03 pm 
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wilsonintexas wrote:
any chance for pictures? It sounds like very interesting stuff. If you cut any can youtell us how it polishes?

I'll upload the video after my exams on Saturday. I took some video of the original piece, before I did the preliminary sawing. Will also take some good pics demonstrating the effect and post them too.


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 Post subject: Re: Dichromatic (not dichroic) blue YAG
PostPosted: Thu Jan 26, 2017 7:30 am 
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don't forget to stop by for taking some spectra!! :lol: :lol: 8) 8) 8) 8) :wink: :wink: :wink:

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