I've had a request for how I make my uncut diamond blocks so I thought I share my method today. I start with an odd shaped 90* angle rectangle. If you don't have these in your scrap bin you can make them by using a rectangle. For the 4 1/2" square background I used for these blocks I used rectangles that were 2-2 1/2" wide and 3 1/2" - 4" tall. Then cut on the diagonal. I cut some from right to left and others from left to right so I had opposing triangles. Lay your triangle over your background square so the 90* angle edges line up with one corner of your background square.
Line up the edge of your triangle along the crease it made on your background fabric. You will want to make sure the the point on the short side of your triangle only hangs over 1/4" the point on the long side will hang over more. Sew 1/4" along the edge of your triangle. If you don't have a Hera marker you can eyeball it but I found I did a lot of reverse sewing if I did it this way. I'd always have a part of the background corner showing. Using the Hear marker seemed to take care of this problem.
Repeat process for the desired amount of blocks. I made 270 or 15 x 18 rows. It should measure 60" x 72".