When you look closely at the block we're going to make, you'll see that it consists of four identical sections. One of these sections is indicated with a yellow dashed line. Within a section, you can find two types of inset corners, marked with a blue dashed line and an orange dashed line, respectively.
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| We will assemble one of the two possible inset corners from the top left section. In this example, I'll choose the part indicated by the orange dashed line. For clarity, it’s shown again here. We’ll assemble the light section in the bottom left corner. This part consists of three pieces. |
We start with the small square block and the dark diagonal cut piece on the left. Place these together with the right sides facing each other, as shown in the photo. Ensure the pieces are well-aligned. The square piece should align perfectly on three sides with the diagonal piece, as indicated in the photo. You’ll see I’ve already sewn the other four parts together in pairs, which you can also do now, but it can wait until the inset corner is complete.
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Sew the seam from the top to the bottom, stopping a seam allowance distance from the end of the square piece. Normally, you don't backstitch when sewing quilt blocks, but in this case, you should. Sew about three stitches backward and then forward again. You can now cut the thread. Press the piece open, ensuring the seam allowance is pressed toward the diagonal piece.
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Now place the other diagonal piece with the right side on the assembled piece. Make sure the pieces are well-aligned on the left side.
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Sew the seam at the bottom of the light piece, from the right side to a bit more than a seam allowance from the diagonal edge. Backstitch again here. If this is difficult, you can also flip both pieces over and sew from the first seam you made. You’ll start with a few stitches forward, three stitches backward, and then forward again. Sew to the end of the pieces.
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Now comes the trickiest part. Align both diagonal pieces precisely. You need to fold the block diagonally and press it slightly flat. Pressing is not necessary. Sew from the previously sewn seam to the point. Backstitch at the beginning. The seam you sew is the blue dashed line in the photo. If you haven't yet sewn the remaining four pieces together, do that now. Sew the blocks at the short end of the diagonal pieces as shown in the photo.
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After sewing all three pieces together, press the block. The back should look like the photo.
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You should now have three sections and the loose parts of the other three corners of this block. The three sections together also form an inset corner.
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| You assemble these three sections in the same way. First, sew one diagonal piece to the block, stopping a seam allowance from the edge of the block. Don’t forget to backstitch. |
| Then sew the second piece to the block. Remember to backstitch or forward stitch, depending on which side you start sewing. You always backstitch or forward stitch on the side where you need to stop a seam allowance from the edge of the block. |
| After attaching the second piece, align the diagonal edges and sew the diagonal seam. Backstitch or forward stitch here as well. |
| Once you have sewn this seam, it should look like the photo. Now you can press the block open. |
| There are a total of four corners, each made in this way. |
| Once you have finished all four corners, you can sew them together, and your block is complete. |
Sometimes you come across a quilt block with inset corners. It may seem challenging, but it's quite manageable. By following the instructions in this article, you should be able to do it.
When you look closely at the block we're going to make, you'll see that it consists of four identical sections. One of these sections is indicated with a yellow dashed line. Within a section, you can find two types of inset corners, marked with a blue dashed line and an orange dashed line, respectively.
We will assemble one of the two possible inset corners from the top left section. In this example, I'll choose the part indicated by the orange dashed line. For clarity, it’s shown again here. We’ll assemble the light section in the bottom left corner. This part consists of three pieces.
We start with the small square block and the dark diagonal cut piece on the left. Place these together with the right sides facing each other, as shown in the photo. Ensure the pieces are well-aligned. The square piece should align perfectly on three sides with the diagonal piece, as indicated in the photo. You’ll see I’ve already sewn the other four parts together in pairs, which you can also do now, but it can wait until the inset corner is complete.
Sew the seam from the top to the bottom, stopping a seam allowance distance from the end of the square piece. Normally, you don't backstitch when sewing quilt blocks, but in this case, you should. Sew about three stitches backward and then forward again. You can now cut the thread. Press the piece open, ensuring the seam allowance is pressed toward the diagonal piece.
Now place the other diagonal piece with the right side on the assembled piece. Make sure the pieces are well-aligned on the left side. 
Sew the seam at the bottom of the light piece, from the right side to a bit more than a seam allowance from the diagonal edge. Backstitch again here. If this is difficult, you can also flip both pieces over and sew from the first seam you made. You’ll start with a few stitches forward, three stitches backward, and then forward again. Sew to the end of the pieces.
Now comes the trickiest part. Align both diagonal pieces precisely. You need to fold the block diagonally and press it slightly flat. Pressing is not necessary. Sew from the previously sewn seam to the point. Backstitch at the beginning. The seam you sew is the blue dashed line in the photo. If you haven't yet sewn the remaining four pieces together, do that now. Sew the blocks at the short end of the diagonal pieces as shown in the photo.
After sewing all three pieces together, press the block. The back should look like the photo.
You should now have three sections and the loose parts of the other three corners of this block. The three sections together also form an inset corner.
You assemble these three sections in the same way. First, sew one diagonal piece to the block, stopping a seam allowance from the edge of the block. Don’t forget to backstitch.
Then sew the second piece to the block. Remember to backstitch or forward stitch, depending on which side you start sewing. You always backstitch or forward stitch on the side where you need to stop a seam allowance from the edge of the block.
After attaching the second piece, align the diagonal edges and sew the diagonal seam. Backstitch or forward stitch here as well.
Once you have sewn this seam, it should look like the photo. Now you can press the block open.
There are a total of four corners, each made in this way.
Once you have finished all four corners, you can sew them together, and your block is complete.