Post subject: Identification of Blue spinel with colored filters/UV
Posted: Wed Sep 19, 2012 4:58 pm
Gemology Online Veteran
Joined: Wed Dec 30, 2009 11:44 am Posts: 525 Location: PAKISTAN-Peshawar
Dear friends. I hope that you are well and in good mood. Today I want to share with all of you the presentation of the identification of blue spinel colored by cobalt with the help of colored filters and using UV lamp.
please click on the below link now it required no sing in or password
Post subject: Re: Identification of Blue spinel with colored filters/UV
Posted: Wed Sep 19, 2012 11:40 pm
Gemology Online Royal Princess
Joined: Mon Oct 17, 2005 10:56 am Posts: 6461 Location: The frozen north prairie :-/
Okay, before the link asked for a username and password; now it doesn't .
I am curious, Hamid -- Why were there no tests on natural blue spinel NOT colored by cobalt? The two shown side-by-side would be helpful . In fact, how was it determined ahead of time that the spinel crystals in matrix were colored by cobalt??
_________________ IIJA Registered Gemologist GIA Graduate Gemologist
Post subject: Re: Identification of Blue spinel with colored filters/UV
Posted: Sun Sep 23, 2012 8:51 pm
Site Admin
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
Attached is the Power Point Presentation on Spinel for view (pdf) or download. Click here to download the file [pdfview]http://www.gemologyonline.com/Separation%20of%20Blue%20Spinel%20Colored%20by%20Cobalt%20with.pdf[/pdfview]
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