
Diamond quilt blocks are a fun and versatile pattern to make. They can be created in many different ways, from using half-rectangle triangles to cutting out diamond shapes and stitching them together by hand. The simplest way to piece diamond blocks is to use the half-rectangle triangle method, which creates a 2:1 ratio and a perfect diamond shape. The angle of the corners of your diamond will determine the style of your quilt, with elongated diamonds forming a 60-degree angle. Diamond quilt blocks can be used to create a variety of patterns, from stars to optical illusions, and can be combined with other shapes such as hexagons. Electric Quilt offers a Diamonds border style that allows users to change the number of blocks in the border.
| Characteristics | Values |
|---|---|
| Diamond quilt block size | 4.5″ x 8.5″ unfinished (4″ x 8″ once sewn into a quilt) |
| Half rectangle triangle block size | 2.5″ x 5″ |
| Diamond-in-a-square block size | 4.5″ finished |
| Squares required | 5 (1 big, 4 small) |
| Big square size | 5″ |
| Small square size | 2.75″ |
| Diamond shape | Elongated (60-degree diamonds) |
| Fabric | Patterned, solid, scrap |
| Sewing method | Machine, hand |
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What You'll Learn

Diamond-in-a-square quilt block
The Diamond-in-a-Square quilt block, also known as the Square in a Square, is a fun block to make that allows you to highlight a fabric pattern or fussy-cut perfect details. It is a basic quilt block with a traditional method that involves cutting a diamond and four triangle pieces. However, there are easier methods to ensure foolproof accuracy.
To make a Diamond-in-a-Square quilt block, you will need five squares of fabric, with one larger square and four smaller squares. The larger square will be the focal point of your block, so choose a fabric with a pattern or design that you want to highlight. The smaller squares will be your corners, so they can be made from coordinating scraps or solid-coloured fabric that complements your larger square.
Decide on the size of your quilt block and cut your squares accordingly. A formula to determine the size of the smaller squares based on the size of the larger square is: (Big Square + 0.5)/2 + 0.25. This formula accounts for seam allowances and ensures that your smaller squares will fit perfectly with the larger one.
On the wrong side of each smaller square, draw a diagonal line. Place two of the smaller squares right sides together on the larger square, with the diagonal lines cutting across opposite points of the larger square. Sew along these diagonal lines and then trim the excess corner fabric. Press the triangles and repeat this process for the remaining two smaller squares on the other two sides of the larger square.
Finally, pay attention to the seams when sewing your diamond-in-a-square block to the rest of your quilt. Sew slightly on the outside of the intersection of the seams to ensure that your points are not lost. Press your seams open to reveal perfect points in your diamond-in-a-square quilt block!
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Diamond quilt block patterns
Diamond quilt blocks are fun to make and allow you to highlight a fabric pattern or cut out the most perfect details. You can use a print as the main fabric with a solid accent in the middle or reverse it with a patterned fabric in the centre. You can also use two patterned fabrics, but ensure there is enough contrast between the two so that the piecing is noticeable and the inner diamond pattern appears.
To make a diamond-in-a-square quilt block, the first step is to sew a triangle to two opposite sides of the centre square. You will need to match the centre of the square with the centre of the triangles before sewing. The most common method is to fold the centre square and the long side of the triangles in half and finger press. Match the centres of each and pin. Your triangles will be slightly longer than your square.
To make a diamond quilt block, you can use long, skinny scraps of fabric. Cut four rectangles diagonally, and trim the half-rectangle triangle blocks to 2.5" x 5". This will give a 2:1 ratio, creating the perfect diamond shape. The blocks will be 4.5" x 8.5" unfinished (4" x 8" once sewn into a quilt).
You can also try an economy quilt block, which has a second set of triangles framing the centre block. Alternatively, you can make a diamond quilt block with a larger centre block.
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Diamond quilt block tutorials
Diamond quilt blocks are fun to make and allow you to highlight a fabric pattern or cut out the most perfect details. The process is similar to making a square block, but with a few extra steps to create the diamond shape. Here is a tutorial on how to design diamond blocks for an electric quilt:
Materials and Preparation
Firstly, gather your materials. You can use your scrap fabric to create a lovely mix of scrappy diamond patchwork. For a diamond-in-a-square block, you will need a center square and triangles. You can use a variety of fabrics, such as Art Gallery Fabrics, in different patterns and colors to create contrast and make the inner diamond pattern appear.
Cutting and Sewing
To begin constructing the diamond blocks, follow these steps:
- Cut four rectangles diagonally to create the half-rectangle triangles for the diamond block. The rectangles should be 4.5" x 8.5" unfinished, becoming 4" x 8" once sewn into the quilt.
- Sew two triangles to opposite sides of the center square. The triangles will be slightly longer than the square. Match the centers of the square and triangles by folding them in half and finger-pressing before pinning them together.
- Ensure that your triangles are sewn slightly outside the intersection of the seams. Sewing on the inside will cause you to lose your points.
- Trim the half-rectangle triangles to 2.5" x 5", creating a 2:1 ratio and a perfect diamond shape.
- Sew the diamonds together, staggering the strips by about an inch to minimize excess fabric when trimming.
- Line up the 60-degree line of the ruler with the bottom of the fabric when cutting the diamonds.
Design Ideas
You can experiment with different designs by using contrasting fabrics. Try placing the print fabric as the main material with a solid accent in the middle, or vice versa. You can also use two patterned fabrics, ensuring there is enough contrast for the piecing to be noticeable.
Additionally, consider using thin sashing between the blocks or creating offset rows without sashing for a fun and dynamic design.
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Diamond quilt block methods
Diamond quilt blocks can be designed in various ways, depending on the angle of the corners of the diamond. For instance, placing squares on point will form a diamond, while elongated diamond shapes can be created using the half-rectangle triangle method. This method involves cutting four rectangles diagonally, which can be assembled into a lovely mix of scrappy diamond patchwork.
Another way to create diamond quilt blocks is to use the diamond-in-a-square method. This involves sewing triangles to two opposite sides of a centre square, matching the centres of the square and triangles before sewing. The most common way to do this is by folding the centre square and the long side of the triangles in half and finger-pressing to match the centres. The triangles will be slightly longer than the square.
The diamond-in-a-square method can also be used to create a Halloween-themed quilt, using patterned fabrics and solids. The centre block can be made bigger by cutting the fabric to the desired size.
For those who prefer hand stitching, the English Paper Piecing (EPP) method offers greater flexibility and control. This involves cutting diamond shapes out of paper and then cutting fabric shapes out that are 1/4" larger all around. The fabric is then basted or stuck to the paper, and the shapes are stitched together by hand, allowing for the creation of hexagons with the diamond shapes.
When creating a diamond quilt, colour choice is important. For an optical illusion effect, the lightest diamond should be on top, the darkest to the left, and a medium-toned diamond to the right.
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Diamond quilt block arrangements
Diamond quilt blocks can be arranged in a variety of ways to create unique and beautiful quilts. Here are some tips and techniques for arranging diamond quilt blocks:
Firstly, the diamond-in-a-square block is a popular choice for quilt makers. This pattern involves sewing triangles to two opposite sides of a centre square, creating a diamond shape within a square frame. To ensure perfect points, pay close attention to the intersection of seams when sewing the diamond-in-a-square block to the rest of the quilt. Sew slightly outside the intersection to maintain the points.
Another method for creating diamond quilt blocks is to cut your diamond shapes from paper and then cut fabric shapes that are slightly larger, typically 1/4" (6mm) larger all around. Baste or stick the fabric to the paper, and then hand stitch the shapes together. This method offers more control over corners and points, allowing for more complex combinations of diamond shapes, such as hexagons.
When designing your quilt, consider the fabric patterns and colours. You can choose to have a print as the main fabric with a solid accent in the middle, or reverse this by placing the patterned fabric in the centre. Using two patterned fabrics can also create an interesting contrast, but ensure there is enough difference between the two so that the piecing is noticeable.
Additionally, the arrangement of the blocks can create different designs. For example, using sashing, thin strips of fabric between blocks, can enhance the overall pattern. Alternatively, an offset pattern without sashing can also be effective, especially with blocks that have a 2:1 ratio. This allows you to alternate the block directions, creating a fun and dynamic design.
Finally, experiment with different sizes and colours of diamonds to create unique optical illusions. For example, the famous "building blocks", "baby's blocks", or "tumbling blocks" pattern requires specific colour placement for each diamond: the lightest diamond on top, the darkest to the left, and a medium tone to the right.
With these tips and techniques, you can create stunning diamond quilt block arrangements and explore your creativity.
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Frequently asked questions
The easiest method to create diamond quilt blocks is to use the half-rectangle triangle method. This method involves cutting four rectangles diagonally to create the half-rectangle triangles that form the diamond block.
The economy quilt block typically has an additional set of triangles framing the centre block, whereas the diamond-in-a-square block does not.
In Electric Quilt, you can design diamond blocks by utilising the Diamonds border style option. This allows you to adjust the number of blocks within the border by using arrows or manually entering a number.
To cut diamond shapes accurately, use a quilting ruler with a 60-degree angle marking. Line up the ruler's 60-degree line with the edge of your fabric and cut along it. Make parallel cuts by turning the fabric so that the angled cut is on the left, then measure and cut accordingly.








































