Jewelry artisan, Patricia Johnson, designs and makes all her jewelry including the dichroic glass.  Dichroic glass is glass containing multiple micro-layers of metals or oxides which give the glass dichroic optical properties.  The main characteristic of dichroic glass is that it has a particular transmitted color and a completely different reflected color, at certain angles of view.  Dichroic glass is and example of thin-film optics.  Modern dichroic glass is available as a result of materials research carried out by NASA and its contractors, who developed it for use in dichroic filters.  However, dichroic glass dates back to at least the 4th century AD.  -Wikipedia