According to Wikipedia, "dichroic glass is glass containing multiple micro-layers of metal oxides which give the glass dichroic (having or showing 2 colors) optical properties".
Very often, when you see fused glass at festivals, it is created using dichroic glass...sparkling, lovely and multi-faceted. I don't use this type glass exclusively, but I do enjoy working with it sometimes. In fact it was a piece of dichroic that first attracted my eye and started me down this path.
Below are some pendants I recently created using different types of dichroic glass.