You can use either a diamond cutter or a square cutter. Match up the ends and just keep going till you've finished the whole cake. I would start in the back of the cake so if they don't match up perfectly, it's in the back.
I actually did a bit of a quilted look in a pillow cake i made (its in my pictures) and to do that I just cut a long strip of paper and laid it over the cake in diagonal pattern and marked along the paper with the back of a paint brush.
Its probably not the "best" or easiest way but it worked for me when I didn't have any special tools for it.
If you mark the spaces just slightly when you measure around your cake, then you know exactly where to place the triangle each time. Like if your cake measures 20" and you want 1" diamonds, then place a tiny little mark at the bottom of your cake at every inch. This is where you will line up the right angled corner of your triangle.
If you mark the spaces just slightly when you measure around your cake, then you know exactly where to place the triangle each time. Like if your cake measures 20" and you want 1" diamonds, then place a tiny little mark at the bottom of your cake at every inch. This is where you will line up the right angled corner of your triangle.
This is a great tip! I want to try this!
I just took a class with Jennifer Dontz and she had diamond shaped marker that look like 3 diamonds in a line. Jennifer had 2 differant sizes, a smaller size and a larger size. Jennifer stated that she starts in the back and then adjusts as she is going around if needed to make all appear if it lined up perfectly. 
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