The blog pic shows the cast-on of 33 stitches, as an example of the pattern. For a regular sized cloth, proper cast-on amounts are also given for the pattern repeat in the amount of 45 stitches, and also for a larger version using 57 stitches.

The example blog pic shows a complete diamond and a half diamond, but to finish with all complete diamonds, when you get to rows 27-30, which tell you to repeat rows 7-10, instead keep going so you repeat rows 7-26.