If you have some tumbled stones, a comparison chart, and are willing to do a little learning, then you should be able to identify many of the stones. See our picture guide to polished stone identification, and our free printable tumbled stone identification chart. We also offer for sale ...
light directing means for directing a collimated beam of light onto a gemstone orientated in a particular known manner to produce an optical output of the internal refraction and reflection characteristics of the gemstone, means for capturing a selected portion of the output in a manner to ...