Part 3

    a. Add a Layer       

    1) Click Layers then New

        On the Layer Properties Window:
        Name = Pearl
        Blend Mode = Exclusion
        Opacity = 75

   b. Create a Circle Selection          

    1) Click The Selection Tool Buttton

        On the Controls Window:
        Type = Circle
        Feather = 0
        Antialias = Checked

    2) Click and Drag From (200,200) to Size = (200x200)

        Status Bar (100,100)->(300,300)=(200x200)[1.000]