Prismatica Diamond Mosaic Throw Free Pattern – Knit a Geometric Color-Block Blanket

Are you ready to create a stunning, modern heirloom piece for your living space? The Prismatica Diamond Mosaic Throw is a bold, contemporary blanket that uses clever slipped stitches to build a mesmerizing mosaic of interlocking diamonds. This pattern is perfect for knitters who want to explore colorwork without the complexity of carrying multiple yarns at once. The result is a graphic, textured, and incredibly cozy throw that will become the centerpiece of your home decor.

This free pattern is designed to be accessible for confident beginners and satisfying for experienced knitters. By working with worsted weight yarn and a simple slipped-stitch technique, you'll create a flat, smooth fabric with a woven, intricate appearance. Let's dive into this rewarding project and craft a blanket you'll treasure for years to come.

Materials Needed

Before you begin, gather the following materials to ensure a smooth and enjoyable knitting experience:

• Yarn: Worsted weight yarn in 4 colors:
  • Color A (Deep Teal): 300 yards (for background and borders)
  • Color B (Amber Gold): 300 yards
  • Color C (Crimson): 300 yards
  • Color D (Cream): 300 yards
  Total yarn needed: approximately 1200 yards.
• Needles: US 8 (5 mm) knitting needles. A circular needle (at least 32 inches long) is recommended for the large number of stitches, but straight needles will also work.
• Notions: Tapestry needle for weaving in ends, stitch markers (optional but helpful), and a measuring tape.

Gauge

18 stitches and 24 rows = 4 inches in stockinette stitch. Always knit a gauge swatch to ensure your finished blanket matches the intended dimensions. Adjust your needle size if necessary to achieve the correct gauge.

Step-by-Step Instructions

This pattern is worked flat in rows. The slipped stitches are always done purlwise with the yarn in back (wyib) on knit rows and yarn in front (wyif) on purl rows, unless otherwise noted. Each diamond motif is 12 stitches wide and 16 rows tall. The blanket consists of 6 diamonds across and 5 diamonds tall, framed by a garter stitch border.

Getting Started: Cast On and Border

Cast On: With Color A (Deep Teal), cast on 84 stitches. This number includes 72 stitches for the diamonds (6 diamonds × 12 stitches) plus 6 stitches for each side border (12 border stitches total).

Border Rows: Work 6 rows of garter stitch (knit every row) in Color A. This creates a neat, sturdy edge for your blanket.

The Diamond Motif (Worked Vertically)

You will repeat the diamond motif 5 times vertically, alternating colors according to the sequence below. Each diamond section is 16 rows tall. Between each diamond section, you'll work 2 rows of garter stitch in Color A to separate the motifs and create a cohesive background.

Row 1 (RS): With Color B, knit 6 border stitches, *k6, sl1 wyib, k5*, repeat from * to * across the row, ending with k6 border stitches. (Note: The slipped stitch is the center of each diamond.)

Row 2 (WS): With Color B, knit 6 border stitches, *p5, sl1 wyif, p6*, repeat from * to * across, knit 6 border stitches.

Row 3: With Color B, knit 6 border, *k4, sl1 wyib, k1, sl1 wyib, k4*, repeat from * to *, knit 6 border.

Row 4: With Color B, knit 6 border, *p4, sl1 wyif, p1, sl1 wyif, p4*, repeat from * to *, knit 6 border.

Row 5: With Color B, knit 6 border, *k3, sl1 wyib, k3, sl1 wyib, k3*, repeat from * to *, knit 6 border.

Row 6: With Color B, knit 6 border, *p3, sl1 wyif, p3, sl1 wyif, p3*, repeat from * to *, knit 6 border.

Row 7: With Color B, knit 6 border, *k2, sl1 wyib, k5, sl1 wyib, k2*, repeat from * to *, knit 6 border.

Row 8: With Color B, knit 6 border, *p2, sl1 wyif, p5, sl1 wyif, p2*, repeat from * to *, knit 6 border.

Row 9: With Color B, knit 6 border, *k1, sl1 wyib, k7, sl1 wyib, k1*, repeat from * to *, knit 6 border.

Row 10: With Color B, knit 6 border, *p1, sl1 wyif, p7, sl1 wyif, p1*, repeat from * to *, knit 6 border.

Row 11: With Color B, knit 6 border, *sl1 wyib, k9, sl1 wyib*, repeat from * to *, knit 6 border.

Row 12: With Color B, knit 6 border, *sl1 wyif, p9, sl1 wyif*, repeat from * to *, knit 6 border.

Rows 13-16: Work rows 9 through 6 in reverse order to complete the diamond shape. This means you'll work Row 9, then Row 8, then Row 7, and finally Row 6, creating the bottom half of the diamond.

Color Sequence for Diamonds (Top to Bottom)

To achieve the beautiful color-block effect, follow this sequence for each of the 5 diamond sections:

1. Diamond 1: Color B (Amber Gold)
2. Diamond 2: Color C (Crimson)
3. Diamond 3: Color D (Cream)
4. Diamond 4: Color B (Amber Gold)
5. Diamond 5: Color C (Crimson)

Important: Between each diamond section, work 2 rows of garter stitch in Color A (Deep Teal) to separate the motifs and maintain the background color.

Finishing Touches

After completing the last diamond row (Diamond 5), work 6 rows of garter stitch in Color A to mirror the bottom border. Bind off loosely to ensure the edge remains stretchy and doesn't pucker.

Weave in all ends carefully with a tapestry needle, making sure to secure the yarn tails on the wrong side of the work.

Blocking: To achieve the professional, crisp look shown in the photos, block your blanket to size. The finished dimensions should be approximately 48 inches wide by 60 inches tall. Soak the blanket in lukewarm water with a gentle wool wash, gently squeeze out excess water (do not wring), and lay it flat on a blocking mat. Pin it to the correct measurements and allow it to dry completely. This step will even out the stitches and enhance the geometric pattern.

Your Prismatica Diamond Mosaic Throw is now complete! Drape it over your sofa, fold it at the foot of your bed, or gift it to a loved one. This modern, graphic blanket is sure to be admired for its intricate design and cozy warmth. Happy knitting!