Gradient’s parameters.

Copy this new made layer and make use immediately of Free Transform option to minimize it. Then choose the next tool and press on Shift button to represent a rectangle inside it, the same way it is shown next picture.

Apply the following tool to represent a circle with the parameters form below. Choose again the same tool, but this time press on Alt button to represent an opening like the next one.

Blending Options-Drop Shadow

Blending Options-Bevel and Emboss

Blending Options-Gradient Overlay

Gradient’s parameters.

Apply the last instrument to picture a circle with the sizes shown next step.

Blending Options-Bevel and Emboss

Blending Options-Gradient Overlay