This Heart Thumbprint Key Chain is an easy make for Valentine’s Day, Mother’s Day, Christmas, or a parent/grandparent birthday. I made this as a gift for my mom. My mother, like most moms, loves all things that have to do with her grandchildren/children, so I took some polymer clay and my son’s fingerprint and made a homemade key chain. It was one of the easiest projects I think I have made. Please keep in mind that this will require an oven to bake the clay.

Heart Thumbprint Key Chain Polymer Clay Craft Tutorial Valentine's and Mother's Day

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Heart Thumbprint Key Chain


Heart Thumbprint Key Chain Materials


One: Roll the clay out to your desired thickness. I went with about 1/4 inch thick. 

Two: Use the small heart cookie cutter and press it into the clay. Remove excess the clay.

Heart Thumbprint Key Chain Step 2a

Heart Thumbprint Key Chain Step 2b

Three: Poke a hole into the top edge of the heart. I used a skewer to poke the hole. 

Heart Thumbprint Key Chain Step 3a

Heart Thumbprint Key Chain Step 3b

TIP: After baking mine I realized two things 1) the hole wasn’t close enough to the edge and 2) the hole wasn’t quite big enough. So, make sure your hole is big enough and close enough to the edge to fit the key ring. But…if it’s too close to the edge it will be weak and will break easy.

Four: Press your (or his/ her) thumb into the center of the heart. Don’t press so hard that you compromise the shape or break through the clay, but enough to leave an impression.

Heart Thumbprint Key Chain Step 4a

Heart Thumbprint Key Chain Step 4b

Five: Bake the heart according to the instructions on the clay package.

Six: After the clay cools, decorate. I put my son’s name on one side and the date on the other.

Heart Thumbprint Key Chain Step 6

Seven: Glaze the heart and let it dry.

Eight: Add the key ring to the heart.

Heart Thumbprint Key Chain Step 8

That’s it! As I said, this Heart Thumbprint Key Chain is pretty simple and can be made in about an hour. If you have more than one child, you could put more than one thumbprint and make the heart a little bigger if needed.

For more Valentine’s Day Craft ideas, you may also like:

Rustic Button Valentine’s Heart

If you liked this idea and want to make more clay hearts, check out this Air-Dry or Polymer Clay Hearts from All Free Crafts for ideas.



Heart Thumbprint Key Chain Feature

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