Blending Options-Gradient Overlay

Gradient’s parameters.

Copy the new made layer and apply the parameters from next step.

Blending Options-Bevel and Emboss

Blending Options-Gradient Overlay

Gradient’s parameters.

Take next tool and introduce one more circle that is of next parameters.

Blending Options-Gradient Overlay

Gradient’s parameters.

Keep using the same tool to insert another circle with the next sizes.