How to Grow Your Own Crystals

How to grow your own crystals That’s right, you CAN totally grow your own crystals. I’ve been wanting to try this since last April, when I kept seeing them around Easter. This is a sciency-craft project that people often do with kiddos. I’ve seen a number of tutorials for these online, but I believe it was originally developed by Jim Noonan for the Martha Stewart Show (see his tutorial here)

How to grow your own crystalsYou can find me more often in the kitchen than the, uh, craft room. But this is part craft and part kitchen experiment, so I had to give it a try. I learned a few things and am happy to share my own personal results. AND I use my crystals in another project that I’ll be sharing later this week. I think you’ll like it. But first, let’s grow some crystals. 

Hollow out the eggsSupplies:
-egg shells
-X-Acto knife
alum (sold at most grocery stores in the spice section)
-Elmer’s glue + paint brush
-food dye
-hot water
-plastic containers

Step One: Use an X-Acto knife to cut your egg shells in half. This is messy; do it over the sink. The original tutorial suggested using blown egg shells, but if you’ve ever blown out an egg shell before, then you know it’s not exactly fun (also not the safest activity since it involves raw eggs). You don’t really need to blow the centers out; just cut the egg shell in half over the sink, then wash out the egg shell and let it dry. As you can see, my egg edges were NOwhere near perfect, and that was perfectly fine.

Apply alum to the egg shellsStep Two: Paint on a thin layer of Elmer’s glue to the inside of the egg shells. Sprinkle on the alum. I do not recommend powdered alum. I did one of my eggs with powdered alum and the other three with the kind that you usually use in pickling (it looks like tiny crystals). The powdered alum did not work almost at all, while the other three grew massive crystals. Once you’ve sprinkled on the alum, let this dry out overnight. 

How to grow crystals in an egg shellStep Three: Heat 2 cups of water until it’s just about to boil. Now add the food dye (I used about 40 drops of dye per color) and 3/4 cup alum. Stir until the alum is completely dissolved. Allow the mixture to cool for 10 minutes. Pour the mixture into your container (it may color your container, so I used inexpensive plastic tubs so it would be okay if they got ruined) and add one egg shell, open side facing up. Now let your crystals grow for 8+ hours. I let mine grow for about 20 hours, and the crystals got quite big!

How to grow your own crystals Remember to wear gloves anytime you are adding eggs to the dye bath or taking them out, as it can really stain your hands. Gently rinse off your finished crystals and allow to dry. 

Why egg shells? Good question. I liked the idea of using egg shells because they create an inverse kind of dome for the crystals to grow in/out of, like a geode. You could use lots of different objects to grow crystals on, though; it doesn’t have to be egg shells. Like, you could easily follow the steps above and use a small rock as your base instead.

You might also be wondering how fragile these are; I know I was. They are fragile enough that if you dropped one, even from only five or six inches, they would likely crack. If you dropped them from fairly high, like waist-high to the floor, they would likely shatter. But if you don’t drop them, they can last for a very long time. I’ve had mine for over three weeks now, and they still look like the first day I made them. So, what to do with these new crystals? There are probably a million ideas, and I’ll show you what I decided later this week. Let me know if you have other questions, and if I have an answer based on my experience, I’ll let you know. xo. Emma

Update: I shared how I turned my crystals into geode paperweights, you can see the project here

Credits // Author and Photography: Emma Chapman. Photos edited with A Beautiful Mess actions.

  • Do these last a long time if they are not dropped. Could i put them in a place tgey wont get wet. Would it be possible use the crystals and have hang from a chain. I want to try this but so many questions

  • Greetings! I love this idea, truly. They look so fascinating. Unfortunately, I am a touch confused. Does it really take 3/4 cup for just one egg?? ~Mime

  • These are so vibrant and fun! I can see myself using them for all sorts of projects! Thanks for sharing!

  • Why does your picture show a McCormick Alum if you say that’s the kind to avoid? That’s obviously not the kind u use if u need 3/4 cup of it.

  • I’m a bit confused – it was mentioned not to use powdered alum – did you use what you pictured above (which I assume) or were you showing what not to use? The one pictured looks powdered which is why I’m confused. Sent hubby to get a few ingredients for this and the no make cookies. Can’t wait to get started!

  • I love this post! Cant wait to try this out myself. When I was younger I had a crystal making kit, but this sounds so easy to make 🙂

  • In the interest of longevity and stain-proofing, would it be possible to coat the end result with a layer of clear, glossy spray paint? I noticed one reader said the color bleeds when it gets wet. This may also be the way to add the glitter that another reader mentioned.

  • Love this! Am definitely going to try it with my nieces when they come over next weekend!

  • Hi Lee! Send me an email at Support AT redvelvetart DOT com (include a screenshot showing the error if you can) and I’ll do my best to help you with that! 🙂 – Jacki

  • Love your new website design. I use an iPad and the new site design won’t allow me to “enlarge” the page. The old site did and it was easier for me to read the text. Any way to get that capability back?

  • Try clicking on the picture you want to pin. I think if your attempting to use the pin it button on your browser-that’s what is not not retrieving the picture.

  • I have to try this way because when I did it a different way it didn’t work at all. Thank you for such a helpful blog post. I can now make crystals!

  • I’m definitely trying this out with my little sister! She’ll LOVE it as she is a BIG fan of rocks, crystals, and any other type of pebble. I’ll make sure to show you guys our finished product.


  • Just found one pound bags of Alum on amazon prime for 8 bucks:

  • Wow, this is so cool! I haven’t seen anything like it before. I’m definitely going to try this one.

  • Yes, mine did. If you have any disposable spoons or popsicle sticks laying around you can use those to help push the eggshell to the bottom of the container if it needs help. Once it’s on the bottom of the container it will stay there.

    Good luck!


  • What an amazing experiment! I SO want to make these. Emma, you da bessss.

    bec x |

  • So cute and fun! I remember growing crystals all the time and pretending to be a scientist when I was little.

  • Oh, I love this project. Totally adding to my list! Just a clarification about the egg shells- will they stay open side up when submerged under the water?

  • I can’t wait to grow some crystals! I’ve been all into this kind of hippy dippy shit lately (I’m jonesing for a salt lamp as well). I’m definitely going to do this sciencey stuff for my weekend project 🙂 I can’t wait to see what tutorial you have coming up on what to do with the crystals! And the new layout looks incredible

    The What’s In Between

  • This looks so fun! I am going to have to try this with my son! Maybe on a snow day this year we’ll get it started…

  • I was wanting to do this after my using a geode as inspiration for my school design project, but lost the link to the ‘experiment’ — So glad I can try it now!

  • These look so cool!! Really want to try this out soon, would it still work with some glitter thrown in?

  • I have made crystals with my kids before, but these are different, they will love these. I can’t pin though. Is it your site or am I the one with issues?! It’s usually me 😉

  • I can’t say for certain since I didn’t try adding glitter, but I would bet it would work. You can’t really control the way (direction or size) the crystals grow so I would recommend trying to make sure you evenly distribute the glitter as best you can in the solution, otherwise you could get a lot of glitter in one area and not others. But, maybe that would look cool? Who knows. If you try it let us know what you think.


  • What?! This is so cool! I’m definitely doing this as soon as i get some alum! xoxo

  • Awesome! It looks so cool. I wish I had known this as a child because its the perfect combo between DIY and science indeed. But also when you’re a grown-up, great tutorial. For sure want to try it

  • You can check any place that sells grocery items in bulk (like Sam’s Club, Costco, or whatever is in your area of the world). I didn’t check online but if you know a good resource let us know as I’m sure other readers would love to hear.


  • Wow, this looks totally unreal! I bet this would be a super fun “science project” to do with kids.


  • Submerged, open side facing up. It will pretty easily sink right to the bottom.


  • Where do you find Alum in large amounts?

    And 3/4 cup per batch – is that for as many eggs shells as you can fit in the container, or one crystal per batch?

  • this looks awesome! what a fun DIY project, the color and shape possibilities are endless 🙂

  • I have never heard of this before and I don’t know why! I now have an awesome DIY project to do with my boyfriend – thank you for this!


  • The crystals look awesome, well executed project…cant wait to see what you did with these…


  • I used to make these as a kid! So much fun until you get them wet. Then they stain everything nearby. Keep them safe and dry and they stay beautiful for a long time!

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