These next steps are almost exactly the same as the bracelet. Use the Marquee Tool to draw a rectangular shape and fill it with a linear gradient (black-white-black).
On the links I used the Elliptical Marquee Tool. This is what you should do with the left part. The differences is that you should delete the part where the gradient is above the pipe this time and reverse the gradient (white to the left). The carving on the left is just a simple stroke with 0 % fill opacity and Bevel and emboss (Direction - down)
The right side of the pipe is also strokes with 0% fill opacity and Bevel and emboss (Direction - down). Do as many layers you have to and place them in order direct under each other. If it's hard to move each layer straight use the down arrow key) When you're ready, merge them. The last thing you do is to load the layers opacity (Ctrl-click on the merged layer in the layerpalett) and go to Filter>>Distort>>Spherize. Use Vertical Mode 100%.
The two little buttons on the right side of the watch is only a gradient pipe witch I rotated and erased on the right to get a curved side. You can see above.
The three rings is just circles with 0% fill opacity and the layer style Stroke, fill type - gradient (white-grey-white-grey), style - linear
More Tutorials: 
It is very impressive tutorial. Hard to repeat but still nice.