Implementing Icon (font awesome, etc) into Node

Alright so from that code above I am using this with the $(go.Node, “Auto”, :

   graph(go.Shape, "Circle",
        	{ fill: "lightcoral", strokeWidth: 4, stroke: "gray", width: 30, height: 30 }),
    	graph(go.Shape,
      		{ margin: 3, fill: "white", strokeWidth: 0 },
      		new go.Binding("geometryString", "geo", geoFunc)),

The only thing that isn’t happening is that white fill isn’t taking place inside the circle, which I’m not really sure why. I don’t have any errors…do I need to have the colors array from that icons example?