1. Create a white colored circle. 2. Duplicate the layer by pressing control+J. 3. Right click on its layer name. Select blending options and click on color overlay. Change the color to black.
4. As shown in the figure, draw a circle with the help of Elliptical Marquee tool.
5. Now, press delete. 6. Keep the selection active and do 2 things :- a. Press shift+control+n to have a new layer. Select dark grey as foreground and black as background color. Fill the selection with gradient tool. b. Press control+d to deselect. Press 'D' to change the foreground and background colors to default black and white. Again right click on the layer name in layer pallate, select blending options and click on stroke. Select gradient as fill type and add 3 point stroke in the layer.
