This is a Gamma Correction node arrangement to create metallic gold as per Bagginsbill.  The render was performed in PP2010 using 1 infinite light, BB's envsphere and IDL.  As BR replied, you need something to reflect in your scene; in my case, just the sphere is enough.  If you are not using PP2010 or PP, and still want to Gc the MAT, you will need to change the Add Math_Function on the lower right to 2.2.