little lonestars quilt

How to Match Diagonal Seams When Piecing Your Quilt

You will need

  • quilting ruler - my most used ruler is an OmniGrid 6x24
  • marking tool - my favorite is the Clover Chaco liner

1. Mark your seam allowance Along the edge you want to stitch

I like to take the total measurement of my piece and subtract 1/4" so that if my piece is not perfectly cut, excess is added to or subtracted from the seam allowance instead of my finished block. You could mark the entire stitching line but the end goal is to have 3 intersections so I only mark where my line would cross my existing seam and each end.

How to Match Diagonal Seams When Piecing Your Quilt | quilting, quilt, technique, skill builder, skill building

2. Rotate your piece and mark the ends

Make a mark 1/4" in from each end that intersects the marks you made for your stitching line.

How to Match Diagonal Seams When Piecing Your Quilt | quilting, quilt, technique, skill builder, skill building

3. Repeat on the opposite piece

You may want to make these marks on the wrong side of the fabric so that when you lay your pieces right sides together the marks are all on the sides facing up.

How to Match Diagonal Seams When Piecing Your Quilt | quilting, quilt, technique, skill builder, skill building

4. Layer your pieces right sides together and pin

Stick your pin straight through each of your intersections (use the diagonal seam in lieu of a second mark for your middle point).

A couple tips:

  • I find that if I stick my pin all the way through so that both layers of fabric are right up against the pin head, it works as a pivot point and helps get my fabrics lined up just right.
  • I start with the middle point first and then do the ends.
  • Depending on how wide your marks are, you may find it helpful to pin just to the inside or outside of your mark (this will depending on your exact measuring and marking technique).
How to Match Diagonal Seams When Piecing Your Quilt | quilting, quilt, technique, skill builder, skill building

5. Stitch and press

Stitch right along your marks (take your pins out as you go, don't stitch over them). Open up your piece and check that your seams line up to your satisfaction. Once it looks good, press your seam open. Your diagonal seams should line up perfectly. 

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How to Match Diagonal Seams When Piecing Your Quilt | quilting, quilt, technique, skill builder, skill building

How to Strip Piece Perfect Diamonds for your quilt

You will need

  • quilting ruler - my most used ruler is an OmniGrid 6x24
  • rotary cutter
  • cutting mat

1. Cut two or more strips of fabric and piece them together with a 1/4 inch seam allowance. Press the seam open.

In this example, I am using strips that are 1 3/4 inches wide cut from the long edge of fat quarters. After piecing and pressing, each strip is 1 1/2 inches wide and my entire unit is 3 inches wide.

How to Strip Piece Perfect Diamonds: Illustration of two fabric strips pieced together.

2. Cut one end of the strip unit at a 45 degree angle.

Most quilting rulers have a 45 degree line on them. Rotate your ruler so that 45 degree line is along the longest edge of your strip unit and then use your rotary cutter to trim the end of the unit. See the pink dashed line below.

How to Strip Piece Perfect Diamonds: Illustration showing how to line up a standard quilting ruler to cut the end of the strip unit at a 45 degree angle.

3. Rotate your strip unit so the edge you just cut is vertical.

That edge is marked with the pink dashed line in the illustration below.

How to Strip Piece Perfect Diamonds: Illustration showing the strip unit with the 45 degree angle edge rotated so it is vertical.

4. Measure in an amount equal to the original width your your strip from the 45 degree angle edge and sub-cut your strip pieced diamond units.

In this example, each unit I cut is 1 3/4 inch wide since I originally started out with 1 3/4 inch strips.

Cut as many diamond strips as desired. Depending on your pattern, you may need to cut your 45 degree angle in the opposite direction for some of your units.

How to Strip Piece Perfect Diamonds: Sub-cut strip pieced diamond units.

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How to Strip Piece Perfect Diamonds | quilting, quilt, technique, skill builder, skill building