Growing Crystals for Kids: Create Your Own Jewels

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This hands-on crystal-growing activity lets kids make jewel-like formations with everyday supplies and a little patience. It’s a fun choice for a rainy afternoon, a science-themed activity, or a supervised group project. Unlike a crochet project, it doesn’t use yarn or stitches—the crystals form as the solution cools and water evaporates.

Why you’ll love this project

The setup is simple, and kids can watch a visible change develop over several days. Choosing between salt, sugar, or Borax also makes it easy to compare how different materials form crystals. The finished strings can be displayed as small science-project keepsakes or given as homemade gifts.

Hot water and Borax require adult supervision. Keep the solution and finished crystals away from young children and pets, and don’t eat the crystals—even if you use sugar.

“We set up the jars together, then checked on them each day. Watching the crystals appear gave the kids a reason to be patient, and they loved seeing how their samples turned out.”

Before you begin

You’ll grow crystals on a suspended piece of string. First, dissolve one chosen base in hot water until the water cannot dissolve any more. Then hang the string in the solution without letting it touch the bottom and leave the container undisturbed for several days.

This is a simple, observation-based activity rather than a crochet pattern. There are no stitches, yarn, hook, or crochet skill level to worry about. Allow several days for crystal growth; the exact time and result can vary with the solution and conditions.

Materials you’ll need

• Salt
• Sugar
• Borax
• Water
• Glass jars or bowls
• String
• Pencil or stick

Choose one base—salt, sugar, or Borax—for each jar. Use a clean glass container and a piece of string long enough to hang into the solution while remaining clear of the bottom.

Step-by-step instructions

1. Choose a base. Select salt, sugar, or Borax. Do not mix the bases in the same solution.
2. Make a concentrated solution. Dissolve your chosen base in hot water in a glass jar or bowl. Keep adding it until no more will dissolve. An adult should handle the hot water.
3. Prepare the hanging string. Tie one end of the string to a pencil or stick.
4. Suspend the string. Rest the pencil or stick across the top of the container so the string hangs in the solution. Adjust it so it does not touch the bottom.
5. Leave the container undisturbed. Set it somewhere it can remain safely for several days. Avoid moving or shaking it while crystals form.
6. Watch the crystals grow. As water evaporates, crystals may collect on the string. Check the container without disturbing it.
7. Remove and dry the crystals. After a few days, lift out the string and let the crystals dry.

Keep the setup out of reach of small children and pets. Don’t taste the solution or crystals, and wash hands after handling the materials.

Ideas for displaying your finished crystals

Hang a dried crystal string in a clear jar or place it beside a completed science-project display. If you grow samples using different bases, label each container so kids can compare their results. The crystals are best treated as display pieces, not toys or food.

Safety, cleanup, and storage

These crystals are not crochet fabric, so yarn washing, blocking, and fiber-care instructions do not apply. Keep the dried crystals in a dry place, away from moisture, which may affect them.

Use adult supervision when preparing hot water or handling Borax. Follow the product label for safe handling and cleanup, keep Borax away from children and pets, and never eat any of the crystals. Clean the jars and work area after the activity.

Tips for better crystal growth

• Keep the string off the bottom. Crystals can grow from the container as well as from the string if it rests against the bottom.
• Leave the jar still. Moving it can disturb the developing crystals.
• Give the project time. The activity takes several days, and growth may vary.
• Use a safe location. Choose a stable spot where the jar will not be knocked over and children or pets cannot reach it.
• Try one base per container. This makes it easier to observe and compare the different results.

Ways to customize the experiment

Make separate samples with salt, sugar, and Borax, using clean containers and fresh solutions. Label each one with the base used and the date it was started. You can also compare different strings, but changing the string may affect where crystals form or how well they stay attached. Keep every sample clearly identified and out of reach; none should be eaten.

Frequently asked questions

Is this a crochet pattern?

No. Despite the crochet-focused format, this activity grows crystals on string and does not involve crochet, yarn, or a hook.

How long does it take to grow crystals?

Leave the solution undisturbed for several days. The growth rate and final result can vary, so check periodically without moving the container.

Can I use salt, sugar, and Borax together?

Use just one base in each solution. To compare them, prepare separate containers and label each sample.

Does the string need to touch the bottom of the jar?

No. Hang it so it stays immersed in the solution but does not touch the bottom.

Is this activity safe for kids?

It can be done with adult supervision. An adult should handle the hot water, and Borax must be kept away from children and pets. Do not taste or eat the solution or crystals.

Why should the jar be left undisturbed?

Movement can disrupt the growing crystals. Leave the container in a stable, safe place while the water evaporates.

Can the crystals be used as decorations?

They can be kept as display pieces once dry. Store them somewhere dry and out of reach of young children and pets.

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