This 1806 Draped Bust Half is the Knob 6, Small Stars variety, Die Marriage O-106. It is considered to be R4 and is in a PCGS XF40 holder.  Most draped bust halves are going to be shades of grey.  When tilted under the light, this example however, has a ring of aqua, amber, and olive toning along the rims and especially on the obverse.  Nice hints of silky luster while rotating under the light.  These are extremely hard to come by with color when they meet CAC expectations.
 
This coin is approved by CAC. 
 
PCGS Cert. #46820460