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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jun 26, 2014 04:58 Post subject: Capturing color change of Alexandrite |
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Alexandrite is well-known for a color change effect under different lights (white and warm). Most photos on the web are shot separately, and only a few are shot under dual lights.
I photographed my alexandrite specimen lit by dual LED lights (white and yellow), and got quite a nice result. You can not only see quite clearly the color shift from side to side, but also see some characteristic inclusions from this locality.
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Chrysoberyl var. Alexandrite Novello Mine, Masvingo (Fort Victoria), Masvingo, Zimbabwe 21 x 20 x 14 mm |
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I found some suspicious phlogopite inclusion details from back-lit photo. |
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Josele
Joined: 10 Apr 2012
Posts: 410
Location: Tarifa, Spain
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Posted: Jun 26, 2014 13:57 Post subject: Re: Capturing color change of Alexandrite |
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Nice images, thanks for sharing. Would be interesting also some photos with single light to see the difference.
_________________ Josele |
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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Posted: Jun 26, 2014 14:48 Post subject: Re: Capturing color change of Alexandrite |
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Very interesting, and a very nicely shaped crystal. I would think the light source on the right is a tungsten light bulb, and the one on the left is LED; is that correct?
My mum once bought a small cut 'amethyst' in a shop in India, and when she took it outdoors and looked at it in daylight it was green! I told her it was alexandrite, but almost certainly the flawless gem was man-made. I hope.
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jun 27, 2014 10:08 Post subject: Re: Capturing color change of Alexandrite |
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Mike Wood wrote: | Very interesting, and a very nicely shaped crystal. I would think the light source on the right is a tungsten light bulb, and the one on the left is LED; is that correct?
My mum once bought a small cut 'amethyst' in a shop in India, and when she took it outdoors and looked at it in daylight it was green! I told her it was alexandrite, but almost certainly the flawless gem was man-made. I hope. |
Both are LED lights. The right LED light has warm yellow color.
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Cascavel1
Joined: 15 Feb 2012
Posts: 29
Location: Arizona
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Posted: Jun 27, 2014 17:02 Post subject: Re: Capturing color change of Alexandrite |
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Nice photos and cool idea. I will have to try that myself with mine.
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 709
Location: Alaska
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Posted: Jun 28, 2014 09:35 Post subject: Re: Capturing color change of Alexandrite |
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It might be good to specify the make and model of your LED lights so people can know what light sources you used. I have tried many models of led flashlights and have found considerable range in color temperature and color rendering index (CRI) in commercial LED flashlights. There are flashlight fanatics who have much to say about the quality of various LED light sources.
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xdxucn
Joined: 24 May 2014
Posts: 100
Location: Shanghai
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Posted: Jun 28, 2014 13:28 Post subject: Re: Capturing color change of Alexandrite |
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Matt_Zukowski wrote: | It might be good to specify the make and model of your LED lights so people can know what light sources you used. I have tried many models of led flashlights and have found considerable range in color temperature and color rendering index (CRI) in commercial LED flashlights. There are flashlight fanatics who have much to say about the quality of various LED light sources. |
I'm afraid I could not find detailed info of my LED flashlights. They use CREE LED component, one emits white light, and another emits yellow light.
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Pete Modreski
Site Admin
Joined: 30 Jul 2007
Posts: 709
Location: Denver, Colorado
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Posted: Jun 29, 2014 14:12 Post subject: Re: Capturing color change of Alexandrite |
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Yes, really neat photos, thank you for posting these!
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