It can also easily be made different sizes:
The pattern is written so that a diamond pattern can be added horizontally (simply repeat the 50-row pattern).
A column (whole diamond + half diamond) can be added or removed to make it larger vertically.
This is crocheted with Lion Brand Pound of Love, size J hook. It can be made with double or single crochet using the popcorn stitch for diamonds and FPdc for bars.