Make the spacing cutter to fit a standard checkering tool handle
One side cuts the other runs in the previous line.
Lay and cut the outside lines.
Lay out the first lines CAREFULLY and check the that the diamonds are shaped as you want. Double check all this. A thin flexible plastic ruler will help with the line layout as it will wrap around the stock to allow drawing the first line.
I have a single line cutter I use for first lines and cleanup.
Start cutting with the spacer cutter once the first line is laid in. The cut lines are straight sided and square bottomed.
If you want make some square silver pegs for extra decoration. Doing every diamond is more than I feel like doing. The square silver pegs only need be in 3/16-1/4". I cut "teeth" in the edges with a sharp chisel.
Stain and finish
Ignore the feet.
Dan