Here is a step-by-step tutorial to make the crochet square pattern you showed.
This design uses tapestry crochet / mosaic crochet style with color-changes to create the white diamond motif on a purple background.

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🧶 DETAILED STEP-BY-STEP PATTERN

Stitches used

• ch = chain
• sl st = slip stitch
• dc = double crochet
• sc = single crochet (only for finishing optional)
• ( … ) = repeat inside parentheses

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⭐ ROUND 1 – Center Flower (WHITE / B)

1. Magic ring
2. Ch 3 (counts as 1 dc)
3. Make 11 dc into ring → 12 dc total
4. Pull tight, sl st to join

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⭐ ROUND 2 – Expand White Center

Still White (B):

1. Ch 3
2. (2 dc in next st, 1 dc in next st) repeat around
   → total 18 dc
3. Sl st

This creates the small 6-sided white center you see.

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⭐ ROUND 3 – Switch to Purple

Start Purple (A):

1. Attach yarn A
2. Ch 3
3. dc in each stitch around → 18 dc
4. Sl st

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⭐ ROUND 4 – Begin Diamond Colorwork

This round begins the motif.
Repeat for each side:

Pattern for 1 side:

• 5 Purple dc
• Change to White: 3 White dc
• Change back to Purple

Full round:

1. Ch 3 (Purple)
2. (Purple 5 dc, White 3 dc) × 4
3. Sl st with purple

You will see the diamond starting to grow.

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⭐ ROUND 5 – Grow Diamond

White sections get bigger.

Pattern for 1 side:

• Purple 4
• White 5
• Purple 4

Full round:

1. Ch 3
2. (A 4 dc, B 5 dc, A 4 dc) × 4
3. Sl st with Purple

Now the diamond looks sharp and points outward.

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⭐ ROUND 6 – Begin Squaring the Shape

Continue tapestry style:

Pattern for 1 side:

• Purple 3
• White 7
• Purple 3

Then add 1 corner:

• (dc, ch 2, dc) in the next Purple stitch

Repeat all 4 sides.

Full round:

1. Ch 3
2. (A 3 dc, B 7 dc, A 3 dc, [A dc, ch 2, A dc]) × 4
3. Sl st

Now it starts turning into a square.

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⭐ ROUND 7 – Square Expansion + Small White Sprinkles

White motif shrinks inward now.

Pattern for 1 side:

• Purple 5
• White 3
• Purple 5

Add corners:

• (dc, ch 2, dc)

Full round:

1. Ch 3
2. (A 5 dc, B 3 dc, A 5 dc, [A dc, ch 2, A dc]) × 4
3. Sl st

You now get the small white side decorations.

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⭐ ROUND 8 – Last Colorwork

Final white sprinkles as in picture.

Pattern per side:

• Purple 6
• White 1
• Purple 7
• White 1
• Purple 6

Corner:

• (dc, ch 2, dc)

Full round:

1. Ch 3
2. (A 6 dc, B 1 dc, A 7 dc, B 1 dc, A 6 dc, [A dc, ch 2, A dc]) × 4
3. Sl st

These single white stitches replicate the tiny white accents.

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⭐ ROUND 9 – Final Purple Round

All purple:

1. Ch 3
2. dc in every stitch
3. (dc, ch 2, dc) in each corner
4. Sl st

This cleans the edges and makes the square neat.

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⭐ OPTIONAL ROUND 10 – Border (Purple)

You may add:

• 1 round single crochet around the square
• sc, ch 1, sc in each corner

This helps with blocking and sewing.

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🌟 Finished!

You now have the exact square motif from the picture.
Colorwork creates the central white diamond and the scattered small white patterns on the outside.

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