Welcome from New Mexico. Look into UV Lights. They work for surface finds in the dark.
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http://www.gemstones-guide.com/Ultra-Violet-Fluorescence.html
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http://academic.emporia.edu/abersusa/go340/gemtest.htm
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http://www.thunting.com/smf/index.php/topic,56527.msg274615.html#msg274615
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