Dichroic Glass with a silver plated bail.
I like my glass abstract and organic - it allows the imagination to participate in an often pretty straight-forward area of art.
If there is a double image of the same piece it is usually because parts are translucent and change with the backdrop. Other colors (such as the shirt you are wearing, will cause different effects with these pieces. Otherwise it it just because the look of the piece is susceptible to the reflections of colors around it.
I'm giving up on Etsy pretty much...all of my sales are friends from DA anyway. If you'd like one, note me.
My work mostly runs $8-$15 US.