How to crochet a diamond Granny Square: 4 easy and free pattern with Step-by-Step Tutorial
This diamond granny square pattern gives a classic granny square more geometric punch. A bold diamond sits right in the center, framed by a solid square border in a contrasting color, so the motif reads as two distinct shapes layered together. It’s a good way to use up leftover yarn from your stash, and the contrast between the diamond and the frame means even a simple two-color combination ends up looking deliberate.
More Granny Squares to Try
Why You Will Love This Diamond Granny Square
What makes this pattern different is how it builds the shape. Most granny squares grow outward in even, repeating rounds. This one starts with two rounds of taller and shorter stitches worked in a deliberate rhythm, which pulls the center into a clean four-point diamond instead of a circle or a typical granny flower. Round 3 does the real shaping work, gradually increasing stitch height around each side to round the diamond out into a square, then the final round adds a simple solid border around the whole motif. What you end up with is a flat, sturdy square that blocks well and holds its shape over time.
Since the diamond and the border use two different colors, this is also a good stash-buster. The center only needs a small amount of your accent color, so it’s a fine project for using up a leftover skein you’ve been saving. Pair it with our heart solid granny square or the star granny square pattern if you want a mixed-motif blanket with a different shape in every square.
Materials You Will Need
- Yarn: Two colors in a light (#3) weight yarn, such as DK weight. Color A forms the center diamond (white in the photographed example) and Color B forms the outer square border (red in the photographed example).
- Crochet hook: A 3.00 mm hook. Sizing up or down will change your finished square size, so keep your hook consistent if you are making multiples for a joined project.
- Tapestry or darning needle: For weaving in ends once your square is complete.
- Stitch marker or marking clip: Helpful for keeping track of the first stitch in each round, especially in Round 2 where the stitch pattern shifts between taller and shorter stitches.
- Scissors: For trimming yarn between color changes.
According to the Craft Yarn Council, light (#3) weight yarns are typically recommended with hooks between 3.0 mm and 4.5 mm, so a 3.00 mm hook on the smaller end of that range will give you a dense, well-defined stitch definition that suits this pattern’s geometric shapes.
Gauge and Finished Size
Worked with light (#3) weight yarn and a 3.00 mm hook, this diamond granny square finishes at approximately 4 inches (10 cm) across. Like most granny square motifs, exact gauge isn’t critical as long as your tension stays consistent from square to square. What matters most is that every square you make for the same project comes out the same size. If you want a larger finished square, switch to a worsted (#4) weight yarn with a 5.00 mm hook, or just add an extra solid round in Color B after Round 4.
Abbreviations
- ch: Chain stitch
- sl st: Slip stitch (used to join each round)
- sc: Single crochet
- hdc: Half double crochet
- dc: Double crochet
- tr: Treble crochet
- dtr: Double treble crochet
- st(s): Stitch(es)
- sk: Skip the next stitch
- rep: Repeat the instructions that follow
Step-by-Step Diamond Granny Square Instructions
This works in four rounds total, with a color change between Round 2 and Round 3. Rounds 1 and 2 build the diamond center in Color A, then Rounds 3 and 4 square it off and frame it in Color B. The stitch chart below is worth keeping open alongside the written instructions, it helps a lot for visualizing exactly where the taller treble and double treble stitches land to form the diamond’s points and the square’s corners.
More Granny Squares to Try
Round 1: Magic Ring Foundation
Start with a magic ring in Color A. This round lays down 12 double crochet stitches divided into four evenly spaced groups, which gives Round 2 a stable, symmetrical base to build the diamond points from.
Instructions: Make a magic ring. Chain 3 (counts as your first double crochet), work 2 double crochet into the ring, chain 2. Work 3 double crochet into the ring, chain 2, repeat this [3 dc, ch 2] sequence two more times. You should have 4 groups of 3 dc separated by 4 chain-2 spaces (12 dc total). Join with a slip stitch to the top of the starting chain 3.
Round 2: Shaping the Diamond
This is the round that gives the motif its name. Alternating a tall treble-stitch cluster with a shorter half double crochet cluster pulls the round into four distinct sides, two sharp points and two gently rounded sides, instead of curving into a circle.
Instructions: Chain 2. Work (2 dc, 1 tr, ch 1, 1 tr, 2 dc) into the next chain-2 space from Round 1, this forms one diamond point. Skip the next stitch, then work 2 hdc. Work (2 hdc, 2 dc, 2 hdc) into the next chain-2 space, this forms one rounded side. Skip the next stitch, then work 2 hdc. Repeat this entire sequence, [point cluster, sk 1, 2 hdc, side cluster, sk 1, 2 hdc], one more time. Join with a slip stitch to the top of the starting chain 2. Fasten off Color A and weave in your ends. You should now have a clearly defined four-sided diamond shape.
Round 3: Rounding the Diamond into a Square
Now we switch to Color B and start turning the diamond’s points and sides into four even square corners. This round uses a graduated run of stitch heights: short stitches where the diamond’s points already come to a peak, building up to a tall double treble with a chain-2 space exactly where each new square corner needs to form.
Instructions: Join Color B with a slip stitch anywhere along the diamond’s edge. Work [1 sc, 1 hdc, 1 dc, 2 tr, (1 dtr, ch 2, 1 dtr), 2 tr, 1 dc, 1 hdc] across each of the diamond’s four sides, working the stitches evenly into the stitches and chain spaces from Round 2 as you go. The (dtr, ch 2, dtr) at the midpoint of each repeat creates the actual corner of your square, make sure you have 4 of these corner chain-2 spaces evenly placed around the piece by the time you join. Join with a slip stitch to the first stitch of the round. Your piece should now look like a rounded square with the white diamond visible inside.
Round 4: Solid Square Border
The final round adds a classic solid granny border, which squares off the edges completely and gives the whole motif a clean, finished frame.
Instructions: Join Color B (or continue if already attached) in any corner chain-2 space. Chain 3 (counts as first dc), work 1 dc, chain 2, work 2 dc, all in the same corner space. Work 11 dc evenly along the side to the next corner. In the next corner chain-2 space, work (2 dc, ch 2, 2 dc). Repeat [11 dc along the side, (2 dc, ch 2, 2 dc) in the corner] two more times to complete all four sides. Join with a slip stitch to the top of the starting chain 3. Fasten off and weave in all remaining ends.
Tips for Perfect Results
- Mark your first stitch in Round 2. Because the stitch heights change so often in this round, it is easy to lose track of where you started. A locking stitch marker in the first stitch makes it much easier to confirm you have worked exactly two diamond points and two rounded sides before joining.
- Keep an eye on stitch count in Round 3. This is the round that does the most shaping work. If your square is coming out lopsided rather than evenly square, double-check that you have exactly 4 corner chain-2 spaces spaced evenly around the piece before moving on to Round 4.
- Block your finished square. A light steam or spray block will square up the corners and even out any minor tension differences between the diamond rounds and the solid border round.
- High contrast colors show off the diamond best. The shaping is subtle up close, so a strong light-against-dark combination (like the white-and-red photographed here) makes the diamond shape read clearly from across the room.
More Granny Squares to Try
Frequently Asked Questions
Can I make this diamond granny square bigger?
Yes. After completing Round 4, keep adding standard solid granny rounds: 3 dc along each side and (3 dc, ch 2, 3 dc) in each corner, to grow the square to whatever size you like for a blanket panel.
Is this pattern beginner-friendly?
This pattern works best for confident beginners who already know chain, slip stitch, single crochet, half double crochet, and double crochet, and who are comfortable working in the round. Treble and double treble crochet are used in Rounds 2 and 3, but both are simply taller versions of a double crochet with extra yarn overs, so they are quick to pick up even if you have not used them before.
Why does Round 2 use a skip stitch?
Skipping a stitch after each cluster in Round 2 keeps the stitch count balanced as you move between the taller treble-based point clusters and the shorter half double crochet side clusters. Without the skip, the round would gain too many stitches and the diamond shape would buckle instead of lying flat.
Do I have to use two colors?
No, you can work the entire square in one color if you prefer a tonal, textured look instead of a high-contrast diamond. The shaping stays exactly the same either way, the color change just makes the diamond shape easier to see.
