The diamond in a square quilt block always looks more complicated than it is. I think that some of the problem is in knowing what measurements to use – it’s not as straightforward as when you are just sewing squares side by side. I have made it here in two very different ways – each one with its own good and bad points. The first method involves adding triangles to the sides of a square so that the square is turned on its side to become a diamond., while the second method uses half square triangles.
First method for making diamond in a square
I began with a 4.1/2″ square for the diamond and a 5.1/4″ square to make the triangles. Cut the larger square along both diagonals to create four triangles.
If you wanted to begin with a 3.1/2″ square you would need a 4.1/4″ square for the triangles.
If you wanted to begin with a 2.1/2″ square you would need a 3.1/4″ square for the triangles.
The longest edge of the triangles will be sewn to the central square. Sew two of the triangles to opposite sides of the square using a 1/4″ seam. The triangle edges are slightly longer than the edges of the square, so make sure that you have an equal overlap on each end. Alternatively, you could mark the middle of both the triangle edge and the square edge and match them up before you sew the seam. Press the seam allowances towards the triangles.
Many quilters now trim the ends of the seams where the triangle tips stick out. I prefer to leave the trimming to the end, but that’s just personal preference.
With right sides together, sew the remaining two triangles to the sides of the square. Press the seam allowances away from the square again. Now you can do all the trimming at once. I line the diamond in a square block up with the lines on my mat and trim across each edge of the square. You should be able to trim 1/4″ away from the corner of the square so that you will keep that tip when you sew the block to another one.
Doing the maths for diamond in a square blocks
I am giving you here the measurements that I get when I make diamond in a square. If you are making many of them for a quilt you would be safest to make one as a sample first to be sure of what measurements you get.
- When using a 4.1/2″ square for the diamond, I made a quilt block 6″ finished size.
- When using a 3.1/2″ square for the diamond, I made a quilt block 4.1/2″ finished size.
- When using a 2.1/2″ square for the diamond, I made a quilt block 3″ finished size.
Now that’s fine if you want to start with a square of a certain size for the diamond, but very often you need a block of a particular size and you need to work out what size square to use for the diamond.
- If you want a 5″ finished size block, use a 4″ (cut size) square for the diamond.
- If you want a 4″ finished size block, use a 3.3/4″ (cut size) square for the diamond.
- If you want a 3″ finished size block, use a 2.3/4″ (cut size) square for the diamond.
Again, I would stress that these measurements work for me, but you would be best trying a sample for yourself.
Second method of making a diamond in a square quilt block
This method is simpler (especially the maths!) but there are more seams and you may find that your blocks become quite bulky.
Using 2.7/8″ squares to make half square triangles, sew four half square triangles together to make a 4″ finished size quilt block.
Using 3.7/8″ squares to make half square triangles will give you a 6″ finished size quilt block.
Using 4.7/8″ squares to make half square triangles will give you an 8″ finished size quilt block.
I hope that’s helped to make diamond in a square quilt blocks seem more easy to make. They certainly are a very attractive addition to a quilt design.
Here’s the video:
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