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Ultraviolet light on alexandrite.

This topic contains 11 replies, has 6 voices, and was last updated by Profile photo of m76steve m76steve 1 year, 7 months ago.

Viewing 12 posts - 1 through 12 (of 12 total)
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  • #70232
    Profile photo of m76steve
    m76steve
    Participant

    When showing my alexandrite pendent using daylight or candlelight I get good results with color change, when I use a shortwave UV light I get a slight reddish tone with a little green in the mix. Is this normal for this type of material?

    Attachments:
    1. dalte001a

      dalte001a.jpg

    2. cndle001a

      cndle001a.jpg

    #71162
    Profile photo of namastenan
    namastenan
    Participant

    Hi Steve ,
    In my limited experience I know Alexandrite changes in sunlight, pretty cool in the UV lighting!!! Great pendant by the way , you have created a lovely piece. Hard to find such pendants, especially with Alexandrite in Canada 🙂

    #72115
    Profile photo of jrasmussen
    jrasmussen
    Participant

    Alexandrite can exhibit up to moderate fluorescence in UV short and long wave light with a red color. Absence of fluorescence does not rule out alexandrite as it can be inert.

    John

    #88550
    Profile photo of gemsofoz
    gemsofoz
    Participant

    how old is this piece? In the last few decade or so they have successfully simulated Alexandrite, it tends to fluoresce more strongly then natural stones. There was a lot of Alexandrite around in the 50s and 60s particularly in costume jewelry as it was cheap then but attractive. If the jewelry is from this era there is a good chance the stones are natural. Keep in mind no one test alone is enough to identify a natural stone, I advise looking for inclusions under a microscope or 25x loop as another way to identify if they are natural or Lab created.

    #89475
    Profile photo of m76steve
    m76steve
    Participant

    gemsofoz, the peice is about 2 yrs old, the stones were cut within the last fifteen yrs my guess. Top stone was removed & lab tested, alexandrite from Sri Lanka, 70%-80% color chg, very good color change. The pendent has been apprsed. at least 5 times over the years & final appr. is in the 6 digit range. the stones are from Russia, India, Ceylon, & Brazil. The picture was shot using candlelight then a flourescent light to asimilate daylight or close to it. Under UV light I get a slight red color using short wave uv, hence my question about uv lighting, the stones are all natural & untreated in 14kt white gold, one more thing, lab alexandrite has almost no green color under daylight conditions, the new synthetic now shows a little green under daylight with todays new material, so buyer beware as with most colored stones-still learning-m76steve…

    #89477
    Profile photo of m76steve
    m76steve
    Participant

    I forgot to mention, no UV lighting was used in the above pictures-m76steve…

    #89481
    Profile photo of gemsofoz
    gemsofoz
    Participant

    awesome piece to have, would be worth more now too as the price of Alexandrite is forever increasing.

    #164545
    Profile photo of cheryl
    cheryl
    Participant

    I have a difficult time photographing Alexandrite also. I know that Wayne Emery has a great photo system for hard to shoot gems. He carries a fine line of photography equipment that is very helpful to jewelers. Everyone knows that a picture is critical when selling gems online.
    Here is the link to his site
    http://www.JewelryPhotoSolutions.com

    Attachments:
    1. 2221

      2221.jpg

    2. Desktop-Studio-216-workflow

      Desktop-Studio-216-workflow.jpg

    #174339
    Profile photo of ladychaplin
    ladychaplin
    Participant

    have u seen the Russian material?

    #176378
    Profile photo of m76steve
    m76steve
    Participant

    ladychaplin, Ive seen alexandrite from Russia, India, Brazil, Sri Lanka, & a few other locations. The stones in my pendant are from Russia, India, & Brazil. This info was supplied at sale of each stone in the item, the info was not verified but the material was verified as natural, untreated alexandrite. The color change effect is as should be, green to red or as close to the ideal as possible. The stuff in the pendant is pretty good overall & the appraisals prove this-m76steve…

    #184954
    Profile photo of m76steve
    m76steve
    Participant

    This is an old post but a good uppost, Im showing pictures of the pendent in daylight then under UV light, the pic under UV is 1 example of showing what a good alex will do under this light source, the top stone glows darker because of a possible higher Fe, iron, content, similar to burmese ruby & burmese red spinel, low iron content gives these stones a bright reddish color that the stones are known for-steve…

    Attachments:
    1. dalte001a-prime

      dalte001a-prime.jpg

    2. alex-UV-light-67

      alex-UV-light-67.jpg

    #189266
    Profile photo of m76steve
    m76steve
    Participant

    This is a pendent update on pictures, re-aligning of stones & framework to the piece as it is today, Feb, 2015. The catseye stones are more in-line & overall pendent has a more finished look-the pics are daylight, 2 candle, lighted in dark room, & the back of the pendent-steve…

    Attachments:
    1. alex-pend-back-A-

      alex-pend-back-A-.jpg

    2. alex-aligned-feb-2015-A-candlelight

      alex-aligned-feb-2015-A-candlelight.jpg

    3. alex-aligned-feb-2015-A-daylight

      alex-aligned-feb-2015-A-daylight.jpg

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