Blue and lime green crocheted squares in diamond pattern on wooden rod with decorative tassels.

Sunlit Lattice Diamond Strand Curtain Crochet Pattern

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The Sunlit Lattice Curtain is a hanging window or doorway curtain made of lacy diamonds. Each diamond is built from scallop-shaped fans with open arches between them, then outlined with a firm single crochet edge. The diamonds link tip to tip into long vertical strands, and every strand ends in a full tassel.

The sample alternates cobalt blue and pale lime green strands. With daylight behind it, the fans look like little stained-glass shells. The gaps between strands let light and air through, so it suits a sunroom, patio door, or kitchen window.

This pattern uses US crochet terms. One finished diamond measures 4.75 in (12.1 cm) wide by 6.5 in (16.5 cm) tall. The curtain has 10 strands of 12 diamonds. It is about 47.5 in (120.7 cm) wide and 90.5 in (229.9 cm) long, including the hanging loop and tassel.

Construction is simple and repetitive. You work each diamond body in rows from the bottom point to the top point, then add a two-round single crochet border. Each diamond joins to the one above it during the last border round, so there’s no sewing. The tassels go on last.

Finished Size and Construction

  • Finished curtain: 47.5 in (120.7 cm) wide x 90.5 in (229.9 cm) long
  • Skill level: Intermediate
  • Terminology: US crochet terms
  • Yarn weight: DK / light worsted (#3), cotton or cotton blend
  • Hook: 4.0 mm (G-6)
  • Number of pieces: 120 diamond motifs + 10 tassels
  • Layout: 10 strands, 12 diamonds per strand, colors alternating by strand
  • Piece size (bordered): 4.75 in (12.1 cm) wide x 6.5 in (16.5 cm) tall
  • Size before border: 4 in (10.2 cm) wide x 5.5 in (14.0 cm) tall
  • Border depth: 3/8 in (1.0 cm) per side, 2 rounds

Materials

Choose a smooth mercerized or combed cotton in DK weight. Cotton keeps the fans crisp and hangs straight. Acrylic tends to stretch over time in a long hanging piece. Look for roughly 120 m per 50 g.

  • Color A, pale lime green: 450 g (1,080 m), about 9 balls of 50 g / 120 m
  • Color B, cobalt blue: 450 g (1,080 m), about 9 balls of 50 g / 120 m

Each color covers 60 diamonds at about 6 g each (360 g) plus 5 tassels at about 5 g each (25 g). That’s 385 g used, so the quantities above include a margin of about 15%.

Tools:

  • 4.0 mm (G-6) crochet hook
  • Tapestry needle
  • Scissors and stitch markers
  • Stiff card, 5 in (12.7 cm) tall, for tassels
  • Blocking mats, rustproof pins, spray bottle
  • Curtain rod with 10 hooks or rings

Abbreviations (US Terms)

  • ch – chain
  • sl st – slip stitch
  • sc – single crochet
  • dc – double crochet
  • sp(s) – space(s)
  • st(s) – stitch(es)
  • tch – turning chain
  • rnd – round

Special stitches:

  • Fan: 7 dc worked into the same stitch or space.
  • V-st: (dc, ch 2, dc) worked into the same stitch or space. The ch-2 sp in the middle is the “V sp.”

Gauge and Checkpoints

Make one complete diamond and block it before you start the rest. Each strand has 12 diamonds, so a small error in one diamond repeats 12 times.

  • Fan gauge: one Fan = 1.25 in (3.2 cm) wide
  • Border gauge: 18 sc = 4 in (10.2 cm), or 4.5 sc per inch

Checkpoints:

  • After Row 1: the Fan is 1.25 in (3.2 cm) wide.
  • After Row 5: the widest row is 4 in (10.2 cm) across and 3 in (7.6 cm) tall from the bottom point.
  • After Row 10: the body is 4 in (10.2 cm) x 5.5 in (14.0 cm).
  • After Border Rnd 2: the diamond is 4.75 in (12.1 cm) x 6.5 in (16.5 cm).

If the diamond is too big, switch to a 3.75 mm hook. If it’s too small, switch to a 4.5 mm hook. Check your dc height as well, because tall, loose dc make the diamond too tall even when the width is right.

A deep blue crocheted textile with intricate open diamond-shaped lacework, held up to a soft, blurred garden background.

Diamond Motif (Make 120)

Leave a 6 in (15.2 cm) tail and start at the bottom point.

Row 1: Ch 4, 6 dc in 4th ch from hook (skipped ch count as first dc). Turn. (7 dc = 1 Fan)

Row 2: Ch 5 (counts as dc + ch 2), dc in first st (V-st made), sk next 5 dc, V-st in top of tch. Turn. (2 V-sts: 4 dc, 2 ch-2 sps)

Row 3: Sl st in first dc and into first V sp, ch 3 (counts as dc), 6 dc in same sp, Fan in next V sp. Turn. (14 dc = 2 Fans)

Row 4: Ch 5 (counts as dc + ch 2), dc in first dc (V-st made), ch 2, sk next 2 dc, sc in next dc (center of Fan), ch 2, sk next 3 dc, V-st in sp between Fans, ch 2, sk next 3 dc, sc in next dc (center of Fan), ch 2, sk next 2 dc, V-st in top of tch. Turn. (3 V-sts, 2 sc, with 4 ch-2 sps between them)

Row 5: Sl st in first dc and into first V sp, ch 3 (counts as dc), 6 dc in same sp, sk ch-2 sp, sc in next sc, sk ch-2 sp, Fan in next V sp, sk ch-2 sp, sc in next sc, sk ch-2 sp, Fan in last V sp. Turn. (21 dc + 2 sc = 23 sts; 3 Fans)

Row 5 is the widest row and forms the side points. Check that it measures 4 in (10.2 cm) across.

Row 6: Sl st in first 4 dc (to the center of the first Fan), ch 1, sc in same st, ch 2, V-st in next sc, ch 2, sk next 3 dc, sc in next dc, ch 2, V-st in next sc, ch 2, sk next 3 dc, sc in next dc. Turn, leaving the rest of the Fan unworked. (3 sc, 2 V-sts)

Row 7: Ch 1, sc in first sc, Fan in next V sp, sc in next sc, Fan in next V sp, sc in last sc. Turn. (14 dc + 3 sc = 17 sts; 2 Fans)

Row 8: Sl st in first sc and next 4 dc, ch 1, sc in same dc, ch 2, V-st in next sc, ch 2, sk next 3 dc, sc in next dc. Turn. (2 sc, 1 V-st)

Row 9: Ch 1, sc in first sc, Fan in V sp, sc in last sc. Turn. (7 dc + 2 sc = 9 sts; 1 Fan)

Row 10: Sl st in first sc and next 3 dc, ch 1, sc in next dc (center of Fan). (1 sc = top point)

Don’t fasten off. The fans now stack 1-2-3-2-1, which gives the long diamond shape with arches between the fans. Check that the body measures 4 in (10.2 cm) x 5.5 in (14.0 cm).

Make All Pieces

For every diamond, work body Rows 1-10 and Border Rnd 1. Save Rnd 2 for later, because it’s the joining round and you work it as you build each strand.

  • Color A (lime): 60 diamonds, 5 tassels
  • Color B (cobalt): 60 diamonds, 5 tassels

Layout grid (strands numbered left to right, rows top to bottom; A = lime, B = cobalt):

Strand:  1  2  3  4  5  6  7  8  9  10
Row 1:   A  B  A  B  A  B  A  B  A  B
Row 2:   A  B  A  B  A  B  A  B  A  B
 ...     (same for all 12 rows)
Row 12:  A  B  A  B  A  B  A  B  A  B
Tassel:  A  B  A  B  A  B  A  B  A  B

Each strand is one solid color. The strands aren’t joined to each other; they hang side by side from the rod.

Joining

Diamonds join only at their points. The bottom point of one diamond links to the top point of the diamond below it. You make this link with a slip stitch during Border Rnd 2, so the join is part of the border.

Stitch-to-stitch logic: Every finished diamond has a ch-3 sp at its bottom point. When you work the top point of the next diamond in Rnd 2, work (sc, ch 1, sl st into the ch-3 sp above, ch 1, sc). The two ch-1s and the sl st take the place of the ch-3 on an unjoined point. No sc are added or lost, so every diamond keeps exactly 68 sc in Rnd 2.

The ch-3 loop and the joining chain together make a short link about 0.5 in (1.3 cm) long. This small gap gives the strand its beaded look and lets the diamonds turn a little in a breeze.

Tension: Keep the joining ch loose and even. If you pull the sl st tight, the strand puckers at the links and gets shorter. Before you tighten each sl st, check that the two diamonds hang in a straight line.

Size checkpoint: After 3 diamonds, the strand measures 20.5 in (52.1 cm) from top point to bottom point. That’s 3 x 6.5 in plus 2 links x 0.5 in.

Border

The border is 2 rounds of sc. It straightens the stepped edges, sharpens the four points, and makes the raised outline that frames the fans.

Border gauge: 4.5 sc per inch (18 sc = 4 in / 10.2 cm).

Rnd 1: Keep going from Row 10. The Row 10 sc counts as the first sc. Ch 2, sc in same st (top point made).

  • Upper-left side: Work 13 sc evenly down to the side point: 3 sc along each of Rows 9 and 7, 2 sc along each of Rows 8 and 6, and 3 sc down the top edge of the outer Fan of Row 5.
  • Side point: (sc, ch 2, sc) in top corner of last dc of Row 5.
  • Lower-left side: 13 sc, worked 3, 2, 3, 2, 3 into the row-ends of Rows 5, 4, 3, 2, 1.
  • Bottom point: (sc, ch 2, sc) in the foundation ch at the base of Row 1.
  • Lower-right side: 13 sc, worked 3, 2, 3, 2, 3 into the row-ends of Rows 1 to 5.
  • Side point: (sc, ch 2, sc) in top corner of Row 5.
  • Upper-right side: 13 sc, mirroring the upper-left side.

Sl st to first sc. (Each side: 1 corner sc + 13 sc + 1 corner sc = 15 sc. Total: 4 x 15 = 60 sc + 4 ch-2 sps)

Fasten off and weave in all ends now. They’re much easier to hide before the joins are made.

Rnd 2 (joining round): Join yarn with a sl st in the top point ch-2 sp, ch 1, then work the top point:

  • Diamond 1 of each strand: (sc, ch 15, sc) in top sp. This makes a hanging loop about 2 in (5.1 cm) long.
  • Diamonds 2-12: (sc, ch 1, sl st in bottom-point ch-3 sp of the diamond above, ch 1, sc) in top sp.

Continue around: sc in each sc to side point, (sc, ch 2, sc) in side point sp, sc in each sc to bottom point, (sc, ch 3, sc) in bottom point sp, sc in each sc to side point, (sc, ch 2, sc) in side point sp, sc in each sc to top. Sl st to first sc. Fasten off.

(Each side: 15 sc from Rnd 1 + 2 new corner sc = 17 sc. Total: 4 x 17 = 68 sc)

Why the math works: Each side of the body measures about 3.4 in (8.6 cm). At 4.5 sc per inch, that needs about 15 sc, which is the Rnd 1 count. Rnd 2 adds one sc at each end of every side, for 17 sc, or 3.8 in (9.7 cm). The chain spaces at the corners make up the rest of the 4 in (10.2 cm) outer edge. Because the sc counts match the edge lengths, the sides lie flat instead of ruffling or cupping, and the points stay sharp.

Tassels (make 10): Wrap matching yarn 40 times around a 5 in (12.7 cm) card. Tie the top with a 10 in (25.4 cm) strand, then cut the loops at the bottom. Wrap the neck 0.75 in (1.9 cm) below the top. Use the tie ends to attach the tassel through the bottom-point ch-3 sp of Diamond 12. Trim the ends evenly to 5 in (12.7 cm).

Final Blocking

  1. Wet each strand, or spray it if your cotton is mercerized.
  2. Lay the strand flat and straight on blocking mats.
  3. Pin each diamond’s four points to 4.75 in (12.1 cm) wide x 6.5 in (16.5 cm) tall.
  4. Pin out the center of each Fan so the dc spread evenly.
  5. Check that each link is 0.5 in (1.3 cm) and that the strand is 83.5 in (212.1 cm) long, not counting the loop and tassel.
  6. Let it dry completely before you unpin it.
  7. Steam the tassels lightly and comb them straight.
  8. Hang the strands 4.75 in (12.1 cm) apart on the rod.

Final Quality-Control Checklist

  • [ ] 120 diamonds: 60 lime, 60 cobalt
  • [ ] Every body has fans stacked 1-2-3-2-1 with clean arches
  • [ ] Border Rnd 1 has 60 sc and Rnd 2 has 68 sc on every diamond
  • [ ] Each strand has 12 diamonds and 11 links, all one color
  • [ ] Each strand is 83.5 in (212.1 cm) long between hanging loop and tassel
  • [ ] All hanging loops are the same length
  • [ ] Tassels are trimmed evenly to 5 in (12.7 cm)
  • [ ] All ends are woven in and hidden

Troubleshooting

Diamond is wider than it is tall: Your dc are short or your spacer rows are tight. Loosen the ch-2 sps in Rows 2, 4, 6, and 8.

Fans cup or ruffle: Check that each Fan has exactly 7 dc and that you skipped the right number of dc in the spacer rows.

Stepped edges look jagged after Rnd 1: Move one sc from one step to the next, keeping 13 sc per side, and even out the edge when you block.

Points look rounded: Each point needs a ch space between two sc, not 3 sc worked into one stitch.

Strand twists: Make every join with the right side facing.

Strands are different lengths: Measure after every 3 diamonds, and re-block any tight links.

Care

Hand wash in cool water with a mild detergent, roll the strand in a towel to remove water, and dry it flat. If the diamonds lose their shape after washing, pin the points again.

Navy and pale-green crocheted window panel with diamond motifs and tassels frames a sunny garden view with blooming flowers.

Final Notes

Every measurement in this curtain builds on the one before. One Fan is 1.25 in (3.2 cm) wide. Three Fans across give a 4 in (10.2 cm) body. Two border rounds bring the diamond to 4.75 in (12.1 cm) x 6.5 in (16.5 cm). Twelve diamonds and eleven 0.5 in (1.3 cm) links make an 83.5 in (212.1 cm) strand. Ten strands fill 47.5 in (120.7 cm) of rod. If your first diamond measures correctly, the rest of the curtain will too.

Happy crocheting!

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