How to make geodes

This Valentine's Day project is perfect for your gem-loving geologist


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My girl likes to give homemade, crafty Valentines each year. This year, she announced that after she retires from the US Women’s National Team (soccer), she will be a geologist, so *of course* she wants to give geodes for Valentine’s Day.

I’m like, “GEODES? Mmmmmkaaaay.”

This is likely her last year for class Valentines so there’s no way I was saying no, but I’ll admit it was really worried how we were going to pull it off.

We had a trial run by trying a YouTube video involving rock salt and nail polish remover and nail polish, but it didn’t work out nearly as good as I’d hoped. (There are a few photos on my Instagram feed) And there was the whole problem of finding rocks that had craters in them. There were a few other failed brainstorms which I’ll spare you from,  but we settled on this,

DY geodes collection

and she loved it! We paired it with a package of Pop Rocks (because rocks) and put a different punny rock joke on each one.

geode valentines collection

The bag has a tag that says, “Oh my Geode! It’s Valentine’s Day!” as I was under strict instructions, “NO LOVEY-DOVEY!” Sadly, “Hope you’ll be mined!” was off the table. (Special thanks to my Facebook friends who came up with both of those. 😘)

geode valentines

These were actually quite easy to make. Here’s what you need to make exactly what we did, and I’ve even included the free downloads below. (Click images to shop for the products on my Amazon affiliate link.)

materials for geodes

  • 3” white Styrofoam balls – the ones with texture

  • Serrated knife
  • Small knife
  • Black matte spray paint

  • Grey spray paint (can be metallic or silver)

  • Hot glue
  • Glitter

  • Clear bags

  • Pop rocks

  • Avery labels 22830

  • Avery labels 5263

Here’s what you do to DIY your own geodes:

Cut the Styrofoam balls in half with the serrated knife

splitting geodes

Use the little knife to dig out the middle of the half of the ball. The more uneven the better so don’t try and make it neat.

carving geodes

Spray paint the inside of the balls with the grey paint.

spraying geodes

When dry, flip them over and spray the round side with black paint and let dry.

With hot glue, you are going to start putting the glitter on the inside of the Geode. I used three color in each (one has 4).

starting to make a geode

Haphazardly apply glue to the widest part of the carved out area. Use the lightest glitter here.

red geode step 1

Your next row of glitter will be the next darkest color of glue + glitter.

red geode step 2

The middle of the carved out portion will be the darkest.

red geode step 3

Again, don’t make this neat. Nature does not make perfect geodes and you don’t need to either.

Let it all dry and shake off the extra glitter.

close up DIY blue geode

Print our the pun sticker with your inkjet printer, and put them over the nutrition info on the pop rocks.

punny geode valentine

Print the “Oh my Geode!” sticker out and put them on your clear bags.

Stuff the bags with the Geode and joke facing out.

Close bag with the twisty ties that come with the bags and tie with ribbon.

And because photos don’t really do these justice, use a sparkle app and take more photos.

geodes sparkly

If you need a matching “box” to collect your Valentines in, I think a mine cart would be cute. Unfortunately we were not thinking ahead and ran out of time, so I had to turn an unused Halloween pumpkin into her big Geode to collect her classroom loot.

geode large

That’s it! Super simple and perfect for your little nerdling too. 🤓

sparkle large geode



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  1. Crystal D says


    1. Trista Perot says

      Thank you!!!!

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