This is a fused glass cabochon in a silver colored brass pendant made in Turkey.
The glass is primarily blue with flecks of white, brown, iridescent colors and other shades of blue. It has a silver wire wrapped bail.
It is ready to be strung on your own necklace that will fit through the roughly 3mm bail.
Please note that the coloring might be somewhat different since this is a homemade item and glass fires differently each time.