Diamond blocks are among the most popular patterns in the quilting world.  What makes them so challenging are the set-in corners and center triangle.

 

 

 

I admit to having difficulty with set-in pieces.  For me they are time consuming and I usually have to do them a couple of times before they fit properly.  Of course, I had to come up with a more efficient way to accomplish the goal.

 

My solution was to divide the corners into half square triangles and to split the center triangle in half.   For the corner squares, trace around your pattern and cut it in half on the diagonal.  Trace around this piece and add seam allowances all around.  Cut the center triangle in half from the center point to the outer edge.  Trace around this and add seam allowances.  Yes, this technique requires more fabric, but you have converted these set in pieces into straight line sewing.

 

 

Sew the half square triangles to the sides of the diamonds as shown.  Sew the center half square triangles to the opposite side the  diamond.  Now join the eight diamonds in straight seams.