The preparations are the same as when working with Hexagons or other paper shapes:
Place the paper shape on the wrong side of the fabric (pin the paper in place if needed). Cut the fabric patch at least ¼ inch (6–7 mm) larger than the paper using good scissors.
Fold over the seam allowance along the edge of the paper. Starting in the middle of the edge, stitch through all the layers with big basting stitches.
At the blunt corner of the diamond, fold over the next fabric edge and stitch over the fold.
Continue the baste along the edge, but stop ½ inch before the tip of the diamond.
Continue to baste around the diamond as before.
Finish off with an extra basting stitch.
DONE!
To sew two diamonds together, place the shapes right sides together.
At the end of the seam, add another diamond or finish with backstitches.
Once patches have been added all around a paper shape, the basting stitches can be removed.