Blending Options-Bevel and Emboss

Blending Options-Gradient Overlay

Gradient’s parameters.

Apply again the next tool to build another line, colored in the same color with the previous one – 464646, exactly like in the picture below.

Merge down now all the layers, composing the next figures

in a group.
Copy the new made group and apply Free Transform selection to turn it around and place it the same way it is shown next step.

And the final result!