Candy Agate Slices

Finished Candy Agate Slices - pink agate and blue agate

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.

Table of Contents

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 polished 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.

If you’re looking to work with the real thing, here is my list of the best rock tumblers to polish your own agates.

Note: Some links in this post may contain affiliate links, which means at no cost to you, I may earn a commission.

Don’t forget to pin it so you can come back to it later!

multi colored agate candy on a table with the title "diy candy agate slices"

Ingredients for Candy Agate Slices

  • Hard Candy in Different Colors (this is a great variety pack, but the dollar store is also where I like to find good variety) – Make sure you use candy that doesn’t have a liquid filling
  • Edible Glitter (I used gold and silver on some of mine)
  • Plastic Bags
  • Aluminum Foil
  • Cooking Spray
  • Paint Brush (Make sure it’s only used for food – this is a great set)

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 the 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

Step by Step Instructions

Prepare the Candy

Start by unwrapping the hard candy and sorting them by color into different plastic bags. These are similar to the ones I’m using.

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.

Make the Agate Slice Tin Foil Molds

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

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Fill the Molds

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 that you want 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

Bake the Candy Agate Slices

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

Paint the Edges of the Agate Slices

Combine a little bit (~1/4 teaspoon) of the gold edible glitter with a couple drops of water. This is similar to the glitter I used.

I just used a scrap piece of tinfoil to combine them.

Mixing edible glitter and water

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

(Make sure the paintbrush you used is only used for food – this is a great set to have on hand).

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.

If you make your own, I’d love to see them! Tag me on Instagram @ab.crafty.

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
Picture of Daniela Kretchmer

Daniela Kretchmer

Daniela is a lifelong crafter who loves to share her passion for crafting. Through classes or learning on her own, she likes to say she'll do pretty much any craft aside from scrapbooking. Her current personal obsessions include garden crafts, felting, and spinning yarn.

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4 thoughts on “Candy Agate Slices”

    1. Yes, absolutely! If you make them ahead of time, be sure to put them in an airtight container. You can layer parchment paper between the layers to keep them from sticking to each other. They’ll also get sticky if exposed to moisture/humidity.

    1. Thank you! No, you don’t have to make the hole in the middle. Plenty of agate do not have holes. Without the hole I would recommend putting one color in the center and then making rings around it.

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