Candy Agate Slices

Learn how to make agate slices out of candy. This unique rock candy geode slice is great on its own or as a decoration on top of geode cakes.

Finished Candy Agate Slices - pink agate and blue agate
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I absolutely adore these DIY agate slices and they’re so easy to make. They make for a different take on your classic rock candy since these are actually edible geodes. You could even trick your friends into thinking you’re eating rocks!

Since geode cakes have become popular, these also are perfect as geode cake toppers.

And if you’re a geology fan, you could make your candy look like the real gemstones. I made my take on blue agate and pink agate, but there are so many different types of these gemstones including black, white, purple, and yellow.

Note: Some links in this post may contain affiliate links, which means at no cost to you, I may earn a commission.  I am likely linking to items that can be trickier to get, making it easier for you to find the supplies you need.

Ingredients for Candy Agate Slices:

  • Hard candy in different colors (the dollar store will be your best friend here)
  • Plastic bags
  • Aluminum foil
  • Cooking Spray
  • Edible Glitter (Optional – I used gold and silver on some of mine)

Template for the Agate Slice Molds

To make it easy to create the molds, I’ve put together this candy mold template you can use. Download it below or in the shop. Feel free to scale it to whatever size you would like to make your candies.

Image of template to make molds for candy agate slices

Download the Free Template

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Instructions to Make the Candies

Start by unwrapping the hard candy and sorting them by color into different plastic bags.

Tip: I also recommend taking note of what flavors they are so you can remember. This way you don’t do something like combine root beer and mint (unless you’re into that sort of thing).

unwrapping red and white hard candy and putting it into a plastic bag

Using a heavy object, crush the candies. Set them aside.

Crushing purple candies in a bag with a glass

Tear off a small piece of aluminum foil and cut a hole in the middle.

cutting a hole into a piece of aluminum foil with an exacto plade

Lift the edges of the hole and fold it on itself to make a wall of foil around the hole. You can also use my free agate slice mold template to make it easier to shape the molds.

using fingers to push tin foil to make a wall around the hole

Do the same process to the outside. This outer-wall will shape the edge of your agate slice so you can make it an oval or any shape you’d like.

folding edges of the tin foil to make a wall

Repeat the process for the number of rock slices you’d like to make.

aluminum foil molds for candy agate slices

Spray the agate molds with cooking spray. (I missed the photo, but be sure to not skip this step or it will be impossible to remove them from the molds!)

Next, choose the color you’d to be in the center of the slice and using a spoon or popsicle stick, spoon some of the crushed candy around the center hole of the mold.

Push it towards the center in an even ring.

Choose another color of crushed candy and do the same thing, laying a new ring around the first. You can also mix colors to make new ones in case you don’t have a color you want. For example, you can make purple with blue and red.

Continue with as many colors as you’d like until you have filled the mold. I personally like mixing the clear and opaque candies as different layers.

Tip: Make sure you add enough candy, otherwise it will be too thin and break when trying to remove it from the mold. So when in doubt, use more.

diy agate mold filled with candy

Place them on a baking tray and bake them at 300 F (149 C) for around 4 minutes or until the candies have melted.

Let them completely cool.

candy agate slices in their homemade aluminum foil molds

Carefully remove them from from their tin foil molds.

removing agate candy slice from mold

Combine a little bit of the gold edible glitter (~1/4 teaspoon) with a couple drops of water. I just used a scrap piece of tinfoil for this.

Mixing edible glitter and water

Using a paintbrush, paint the edges of the candy agate slices with the edible glitter mixture.

painting gold edible glitter onto candy pink agate slice

Let them dry and then you have your finished candy agate slices. You can use them on their own or as adorable geode cake toppers or cupcake toppers.

Look at all of the different variations you can make from yellow agate to green agate to mixing them all together. Be careful to not mix too many colors though or you’ll end up making brown (unless that’s what you’re going for).

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colorful rock candy agate slices resembling pink agate, purple agate, blue agate, green agate, and yellow agate
Finished candy pink agate and blue agate slices with title

If video is more your thing, you can also watch the full DIY candy agate slice tutorial below.

Finished candy pink agate and blue agate slices with title

DIY Candy Agate Slices

Learn how to make agate slices out of candy. This unique rock candy geode slice is great on its own or as a decoration on top of geode cakes.
Yield 4 candy slices
Prep Time 5 mins
Project Time 25 mins
Total Time 30 mins

Materials
  

  • Hard candy in different colors
  • Plastic bags for each color
  • Aluminum foil
  • Cooking spray
  • Edible Glitter Optional - I used gold and silver on some of mine

Equipment

  • Hammer or heavy object
  • Exacto knife
  • Paintbrush

Instructions
 

  • Using a heavy object, crush the candies. Set them aside.
    Crushing purple candies in a bag with a glass
  • Cut a hole in a small piece of aluminum foil.
    cutting a hole into a piece of aluminum foil with an exacto plade
  • Lift the edges of the hole and fold it on itself to make a wall of foil around the hole. You can use this free template as a guide.
    folding edges of the tin foil to make a wall
  • Do the same thing to the outside. This outer-wall will shape the edge of your agate slice so you can make it an oval or any shape you’d like.
    folding edges of the tin foil to make a wall
  • Repeat the process for the number of rock slices you’d like to make. Then spray them with cooking spray.
    aluminum foil molds for candy agate slices
  • Spoon some of one color of the crushed candy around the center hole of the mold.
  • Choose another color of crushed candy and do the same thing, laying a new ring around the first.
  • Continue with as many colors as you’d like until you have filled the mold.
    diy agate mold filled with candy
  • Place them on a baking tray and bake them at 300 F (149 C) for around 4 minutes or until the candies have melted.
    candy agate slices in their homemade aluminum foil molds
  • After letting them cool, carefully remove them from from their tin foil molds. Set aside.
    removing agate candy slice from mold
  • Mix a little bit of the gold edible glitter (~1/4 teaspoon) with a couple drops of water.
    Mixing edible glitter and water
  • Using a paintbrush, paint the edges of the candy agate slices.
    painting gold edible glitter onto candy pink agate slice
  • Let them dry and then you have your finished candy agate slices.
    colorful rock candy agate slices resembling pink agate, purple agate, blue agate, green agate, and yellow agate

Video

Notes

Tips:
  1. Use the free downloadable template to shape the agate slice molds.
  2. I also recommend taking note of what flavors they are so you can remember. This way you don’t do something like combine root beer and mint (unless you’re into that sort of thing).
  3. Make sure you add enough candy, otherwise it will be too thin and break when trying to remove it from the mold. So when in doubt, use more.
Keyword Agate, Agate Slices, Candy, DIY, Geode, Lollipop, Rock Candy

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