A beautiful set of 1.4 tcw trillion cut dichroic (2 color) Oregon Sunstone lever back earrings set in sterling silver.  This stone displays 2 colors, red and green. You can see the green at the tips and is red in the middle.
 
The gemstone was mined in southeastern Oregon, USA.  Colored sunstones are far more rarer as most are almost clear to champagne colored. Dichroic is even rarer because it displays 2 colors, usually green and red. Depending on the viewing angle, sometimes the colors over lap and the color looks like a cola shade.