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Sea Urchin Shells Pattern

Sea Urchin Shells Pattern
4.6★ Rating
2-4 Hours Time Needed
1.9K Made This
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Intermediate Level

Ideal for those with basic crochet experience, featuring slightly more advanced stitches and techniques to expand your skills.

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Bite-Sized Project

Finishes in 2-4 hours—perfect for an afternoon of creative relaxation.

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Cozy Accent

A warm touch for your space that transforms ordinary corners into inviting nooks filled with handmade charm.

About This Sea Urchin Shells Pattern

This pattern teaches you how to crochet decorative sea urchin shells in three sizes: small, medium and large. It includes full round-by-round instructions, shaping steps using a glue-and-water mix, and finishing suggestions for embellishment. Perfect for making little table decorations, bowls for tiny treasures, or gifts.

Sea Urchin Shells Pattern crochet pattern - detailed view of completed project

Clear stitch explanations and recommended yarn/hook combinations are included for each size. You also get practical tips on shaping, finishing, and embellishing your shells for the best results.

Why You'll Love This Sea Urchin Shells Pattern

I absolutely love this pattern because it turns simple crochet stitches into a delicate, sculptural object that looks like a tiny sea treasure. The combination of trebles and tight single crochets creates a lovely textured surface that really pops after shaping. I enjoy how quick each shell is to make so I can experiment with colors and finishes in one sitting. The shaping step with glue and water adds a satisfying hands-on finishing touch that makes each piece unique.

Sea Urchin Shells Pattern step 1 - construction progress Sea Urchin Shells Pattern step 2 - assembly progress Sea Urchin Shells Pattern step 3 - details and accessories Sea Urchin Shells Pattern step 4 - final assembly and finishing

Switch Things Up

I love changing yarn color combinations to give each shell a unique look; try ombre or variegated cotton for subtle depth.

If you want a chunkier shell, use thicker yarn and a larger hook, then shape with water instead of glue.

For an ultra-delicate mini shell, use finer cotton thread and a 1.25–1.5 mm hook to create a tiny pendant or charm.

I often add watercolor or diluted acrylic paint after shaping to bring out the tubercles and texture.

Try sewing on small seed beads before shaping to add sparkle; remember beads must be attached before glue shaping.

Make magnets by gluing a small magnet into the dried shell base for pretty fridge decor.

Create a trio set in coordinated colors and display them in a shallow dish or shadow box.

Experiment with the glue mix ratio—1:1 gives a stiffer finish while 2:1 (water:glue) is more flexible.

Add a varnish or sealant over paint or glitter to protect your finish from flaking.

I sometimes stitch a small loop before shaping to make hanging ornaments; shape carefully to preserve the loop.

Common Mistakes & How to Fix Them

✗ Not pushing the treble stitch forward will flatten the tubercles; push the treble to the front and tighten the following single crochet to form the bump. ✗ Using a hook that is too large creates loose stitches and holes; use a smaller hook than the yarn label recommends for tight fabric. ✗ Skipping stitch counts after rounds causes uneven shaping later; count stitches regularly and correct mistakes immediately. ✗ Drenching the shell in a too-strong glue mix can over-stiffen or discolor yarn; follow the recommended 2:1 water to glue ratio and test first. ✗ Failing to squeeze excess glue-water mix leaves drips and long drying times; gently squeeze out the mix and shape before drying.

Sea Urchin Shells Pattern

Create charming sea urchin shells in three different sizes using simple crochet stitches and a little shaping. This pattern guides you through small, medium and large shells with clear round-by-round instructions, plus shaping and finishing tips. You will learn how to get neat tubercles using treble stitches and how to stiffen and shape your shells for display.

Intermediate 2-4 Hours

Materials Needed for Sea Urchin Shells Pattern

— Main Fabric

  • 01
    100% cotton yarn, recommended small-crochet cotton for detailed shells
  • 02
    Madame Tricote "Camilla" 100% cotton, 50 g = 125 m (used for smaller set)
  • 03
    Drops "Muskat" 100% cotton, 50 g = 100 m (used for larger set)
  • 04
    Small amounts of cotton yarn in accent colors for experimentation

— Tools Required

  • 01
    Crochet hook size 1.5 mm (recommended for smaller shells)
  • 02
    Crochet hook size 2.5 mm (recommended for larger shells)
  • 03
    Optional hooks: 1.75 mm or 2.0 mm if 1.5 mm is uncomfortable
  • 04
    Scissors
  • 05
    Needle to weave in ends
  • 06
    Stitch marker (optional)
  • 07
    White glue and water for shaping
  • 08
    Cup and something to stir (for glue mix)
  • 09
    Rubber gloves (optional, for sensitive skin)
  • 10
    Chopstick or large crochet hook to shape the interior

Progress Tracker

0% Complete

— Small sea urchin shell :

Round 1 :

ch 3 (= 1 dc) and 14 dc in magic ring; join with sl st into top of ch 3 (15)

Round 2 :

ch 1 (=1 sc), sc in same st, 2 sc in each st all around; join with sl st to ch 1 (30)

Round 3 :

ch 1 (=1 sc), sc in next st, tr in next; * sc in next 2 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (30)

Info :

Make sure you push treble crochet stitch forward to front of your work so it forms a little bump (look at the photos), it helps if you make a single crochet stitch which comes after treble as tight as possible!

Round 4 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (30)

Round 5, 7, 9 :

ch 1 (=1 sc), sc in next st, tr in next; * sc in next 2 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (30)

Round 6, 8, 10 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (30)

Round 11 :

ch 1 (=1 sc), sc in next, tr in next; * sc2tog, tr in next; rep from * 8 more times; skip ch1 and join with sl st to next sc (20)

Round 12 :

ch 1 (=1 sc), sc in each st (20)

Round 13 :

working in back loops only sl st in each st all around (20)

Info :

Fasten off and weave in all ends.

— Medium sea urchin shell :

Round 1 :

ch 3 (=1 dc) and 14 dc in magic ring; join with sl st into top of ch 3 (15)

Round 2 :

ch 1 (=1 sc), sc in same st, 2 sc in each st all around; join with sl st to ch 1 (30)

Round 3 :

ch 1 (=1 sc), sc in next st, tr in next; * sc in next 2 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (30)

Round 4 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (30)

Round 5 :

ch 1 (=1 sc), sc in next, sc and tr in next; * sc in next 2 sts, sc and tr in next; rep from * 8 more times; join with sl st to ch 1 (40)

Round 6, 8, 10 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (40)

Round 7, 9, 11 :

ch 1 (=1 sc), sc in next 2 sts, tr in next; * sc in next 3 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (40)

Round 12 :

ch 1 (=1 sc), sc2tog; * sc in next 2 sts, sc2tog; rep from * 8 more times; sc in last st and join with sl st to ch 1 (30)

Round 13 :

ch 1 (=1 sc), sc in next st, tr in next; * sc in next 2 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (30)

Round 14 :

ch 1 (=1 sc), sc in next 2 sts; * sc2tog, sc in next; rep from * 8 more times; skip ch 1 in beg of rnd and join with sl st to next sc (20)

Round 15 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (20)

Round 16 :

working in back loops only sl st in each st all around (20)

Info :

Fasten off and weave in all ends.

— Large sea urchin shell :

Round 1 :

ch 3 (=1 dc) and 14 dc in magic ring; join with sl st into top of ch 3 (15)

Round 2 :

ch 1 (=1 sc), sc in same st, 2 sc in each st all around; join with sl st to ch 1 (30)

Round 3 :

ch 1 (=1 sc), sc in next st, tr in next; * sc in next 2 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (30)

Round 4 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (30)

Round 5 :

ch 1 (=1 sc), sc in next, sc and tr in next; * sc in next 2 sts, sc and tr in next; rep from * 8 more times; join with sl st to ch 1 (40)

Round 6 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (40)

Round 7 :

ch 1 (=1 sc), sc in next 2 sts, sc and tr in next; * sc in next 3 sts, sc and tr in next; rep from * 8 more times; join with sl st to ch 1 (50)

Round 8 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (50)

Round 9 :

ch 1 (=1 sc), sc in next 3 sts, tr in next; * sc in next 4 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (50)

Round 10, 12, 14 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (50)

Round 11, 13, 15 :

ch 1 (=1 sc), sc in next 3 sts, tr in next; * sc in next 4 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (50)

Round 16 :

ch 1 (=1 sc), sc in next, sc2tog; * sc in next 3 sts, sc2tog; rep from * 8 more times; sc in last; join with sl st to ch 1 (40)

Round 17 :

ch 1 (=1 sc), sc in next 2 sts, tr in next; * sc in next 3 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (40)

Round 18 :

ch 1 (=1 sc), sc2tog; * sc in next 2 sts, sc2tog; rep from * 8 more times; sc in last st; join with sl st to ch 1 (40)

Round 19 :

ch 1 (=1 sc), sc in next st, tr in next; * sc in next 2 sts, tr in next; rep from * 8 more times; join with sl st to ch 1 (30)

Round 20 :

ch 1 (=1 sc), sc in next 2 sts; * sc2tog, sc in next; rep from * 8 more times; skip the ch 1 in beg of rnd and join with sl st to next sc (20)

Round 21 :

ch 1 (=1 sc), sc in each st; join with sl st to ch 1 (20)

Round 22 :

working in back loops only sl st in each st all around (20)

Info :

Fasten off and weave in all ends.

— Shaping the shell :

Info :

In a cup mix 2 parts of water with 1 part of glue.

Info :

Immerse crocheted shell into the glue and water mixture (wear rubber gloves if necessary) until it's fully wet.

Info :

Carefully squeeze out excess glue-water mix.

Info :

Start shaping the shell by gently pulling at the crochet fabric and giving it a desired shape. Use something (chopstick, large size crochet hook) to insert into the shell and push the sides of shell slightly outside to give it a nice rounded shape.

Info :

Pull at tubercles to shape them nicely.

Info :

Continue until you are satisfied with it.

Info :

Leave it to dry on a towel.

— Few more tips and tricks :

Info :

I use for most of my small crochet work 100% cotton yarn which has 125 m of yarn per 50 grams. Many brands have this weight. Some examples: Madame Tricote "Camilla", Kartopu "Organica", Anchor "Creativa Fino", Schachenmayr "Catania" and there are many more.

Info :

Yarn label calls for 3,0 mm hook for these yarns but I recommend to use as small hook as you possibly can. I usually work with 1,5 mm. If this feels too uncomfortable then try a bit larger hook like 1,75 mm or 2,00 mm. The smaller the hook, the tighter the stitches and the prettier an end result. But it has to feel comfortable! Crocheting always has to be fun not a struggle :)

Info :

This pattern works great with thicker yarn as well. Remember to use as small hook as you feel comfortable with. I used Drops "Muskat" and 2,5 mm hook with great success (yarn label suggests using 4,0 mm hook).

Info :

Let's talk some more about shaping the shell. I use regular white glue. It's available all over the world. I mix either 2 parts of water to 1 part of glue or 1:1 if I want my end result to be even stiffer. If you have sensitive skin please wear rubber gloves while using glue mix. If you like the feel of cotton yarn and don't want to add any stiffness to your shell you can just wet it in water, give it a desired shape and leave it to dry. I encourage you to experiment and find the way what suits you best!

Info :

I don't recommend using glue for shaping when using thicker yarn. Shape it just with water in this case.

Info :

Finally let's talk about further embellishing your shells. I have used watercolors or diluted acrylic paint to add some extra color to my shells. I've also experimented with adding some glitter and sealing it with varnish. Or hand stitched on some seed beads (must be done before shaping with glue).

Assembly Instructions

  • Fasten off and weave in all ends after completing the rounds for each shell.
  • Prepare glue mix (2 parts water to 1 part white glue) and fully wet the crocheted shell for shaping.
  • Squeeze out excess glue mix, insert a chopstick or large hook into the shell and gently push the sides outward to create a rounded form.
  • Pull at the tubercles (bumpy treble stitches) to shape them nicely before the shell dries.
  • Allow shells to dry on a towel fully before embellishing with paint, glitter or beadwork.

Important Notes

  • 💡Use a small crochet hook and tight tension for neater tubercles and less gap between stitches.
  • 💡Use stitch markers to mark the beginning of rounds to keep your stitch counts accurate.
  • 💡If you have sensitive skin wear rubber gloves when working with the glue-water shaping mix.
  • 💡Do not use glue mix for shaping when using thicker yarn; wet and shape with water instead.

Make a collection of delicate sea urchin shells in three sizes to decorate your home or give as thoughtful handmade gifts. Try soft pastels, bright summery colors, or natural cotton tones to suit your decor. After shaping and drying you can add watercolor washes, glitter, or tiny beads for extra charm. 🐚🧶

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FAQs

What size will the finished shells be?

Finished small shells measure approximately 4, 5 and 6 cm (small set) and larger set measures roughly 5, 6.5 and 8 cm in diameter depending on yarn and hook.

Can I use different yarn weights for this pattern?

Yes, you can use different yarn weights, but this will affect size and the need for glue shaping. Thicker yarns should be shaped with water only and may require a different hook size.

Do I need prior crochet experience for this pattern?

This pattern is rated intermediate because it uses trebles, tight single crochets and shaping techniques, so basic crochet skills are recommended.

How do I shape the shell after crocheting?

Mix white glue and water (2:1), soak the shell, squeeze out excess mix, shape with a chopstick or large hook, pull the tubercles into shape and leave to dry on a towel.