Huge Concrete Geode Eggs

There’s still time to ‘whip up’ some concrete before Easter! But then again, who says these huge concrete geode eggs can’t accent your garden & home any time of year?!

Once you have poured concrete in a mold you are always looking at everything as a potential mold. ‘Hence came my discovery of the usual Easter eggs but now available in huge sizes. AND they come apart without a huge seam – bonus! I especially like that they are HUGE – up to 12″ and transparent.

Rocks & stone:

To add some details these ‘Geodes’ will need some stone or rocks. You could use glass pieces as well but I’d avoid anything plastic as it does not ‘stick’ well with the concrete.

Hint: Pick a colour theme of similar colours as it looks more natural. I’ve even used aquarium gravel, pea gravel and broken car windshields.

Concreting in the house:

These eggs have been in the works for a while, even before it is warm enough outside. Yes, with a bit of planning it does not need to become a huge mess. There are some tips to working with concrete here

  • A bucket of water to dip dirty hands or tools in
  • a container of water
  • Some Rapidset Cementall Concrete mix (best not to substitute) & scoop
  • Mixing tools (attached chopsticks)
  • Mixing container (flexible yogurt or sour cream container)
  • Gloves
  • Dust mask
  • Covered table surface
  • Rag

You know how much like to use this Rapidset Cemetall mix as many of my projects use it. It is super strong and super fast. It mixes with far less water so it is suggested to start with water and add mix.

Add mix to make a consistency of ‘sour cream’ and then wait…

After a couple minutes it will already be more ‘moldable’ and allow some manipulation with your hands.

The Plastic egg mold does not need any release agent since concrete will not stick to the plastic. Have the rocks/stones ready

These eggs are not solid so they are much lighter. To get natural looking ‘veins’ in the geodes this method is somewhat unpredictable.

Put blobs of the thickened mix into the each half and add slivers of sections that have the added stone. Then add more concrete and cover the sections of the stone. Do not force the concrete too much as then the stone will ‘drown’ in the mix. If you take a peak you will see how the stone areas are between the concrete.

Work bottom areas first and then as it hardens (minutes)you can turn the egg and get more sides. The bottom half and top half will each need the mix added even though you could leaves a hole as desired.

I was aiming to have an opening, like a broken egg. I then carefully without too much pressing snapped the 2 halves together. This mix heats up quickly and in an hour you can unmold it


When you un-mold it some of the stone will fall out, as it is not imbedded enough in the concrete, that’s ok. The shapes that the concrete makes tend to look very stone-like & natural. I love this ‘random’ look, as it mimics the layers in many nature created geodes.

An Egg with an opening:

These eggs were very inexpensive so I thought it may be easier to leave an opening. Using my hot knife (xacto knife can also work)I cut a large opening.

Before starting this one you do need to tape the semas with a packing or clear tape. Mix the concrete and wait until it malleable.

To get even more ‘stone veins’ I made thin sections of mix.

Drop in the stones between the veins.

Add more mix and cover the stone as well. Whatever is close to the surface will show later. The walls can be as thins as 1/2″.

Since the inside is rally not that visible I don’t worry about how smooth it is. Note the light blue strip of stone for another vein.

TIP: since they like to roll around it helps to nestle it in a bowl or towel. Rotate once the section has stiffened enough (only minutes).

Notice the shapes of stone here? Much like the veins in natural stone.

It’s coming along nicely since the huge size let my hands fit in easily.

Did I mention that it’s great to be able to see the outcome in an hour?! The way the concrete ‘squishes’ looks very stone-like.

Huge Concrete Eggs!

I’m so pleased with how easy these are and the do not take a lot of mix either.

IF the seam is too noticeable it may needs some sanding.

Whenever I have extra concrete mix I may small disks on a flat surface to cure. These become ‘sanding discs’. Sandpaper doesn’t last well since it is only paper; these work well for quite a while.

Getting Colour & Design

Yes, you can just leave these as is, or as in my case I like to embellish. It’s what I do, never can leave well-enough-alone.

It doesn’t take much, just a bit of added details. Look up some images of stone and geodes and gather some inspiration. Some thin ‘squiggly’ crack lines or some subtle colour.

Maybe a bit of metallic sheen from some silver, copper or gold. I liked the addition of silver to the blue colour scheme. White also added a sparkle.

To make the veins look deeper you can mix a thin watery dark colour and let it run into the cracks. Don’t put very thick paint as it will look too artificial. And if it does eventually peel off it will not be very noticeable since it’s minor. I have concrete bowls that have acrylic paint on them outside for years and they have held well considering the climate in canada.

Amazing little surprises in the garden that look like they just happened naturally.

These are a little like my rock & concrete orbs but a little more Geode-like. I plan to plant some moss and maybe some succulents into the open ones as soon as it s warm enough. Yes, the garden gives me some well-needed refuge from what is happening in the world right now. ‘Food’ for the soul…

Enjoy you garden, embellish it a bit & make something that can give you even a small smile when you pat yourself on the back. Maybe an Easter centrepiece on the table with some greenery.

Be safe & healthy my friends!

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  1. I love your posts!! I am almost an old retired craft teacher and always looking for a new idea. Because you’re directions are so precise, I love learning some new ideas & ways to make renewed ideas with different materials, I try to keep up with your blogs.
    Love, lore

  2. I am not at all sure I’m going to be able to sleep tonight! I actually bought and saved those huge plastic Easter eggs because I was sure they would make a great mold for something.
    I was thinking chocolate but these are insanely better!

    1. Yes, I often lay awake in the middle of the nght as ideas come into my mind… Look around the concrete projects under the home menu, you’ll like what you find!

  3. Thank you for all your wonderful ideas .. if you are on a tight budget you can colour windscreen glass bits by spaying with metalic paints or spray the bits with spray on varnish tthen while its still wet sprinkle with FINE glitter.

  4. Barb, just popped up your site, love love love your work, been looking for something new and not so heavy to do out of cement, I make cement bird baths, and boy are they heavy, I’m 74 now and they are hard to lift, bad year for me, I am in a lot of craft shows, not this year, I’m close to you I think, I live in cheboygan Michigan, so I’m going to call you a neighbor, thank you so such for your talents and sharing them, beckyanna

  5. Thank you so much for this post and all the best for your future. You are really a talented person I have ever seen. I am satisfied with the arrangement of your post.

  6. I love both your planters and these eggs. is there a special search term to find the semi-precious rocks or where you have found raw stone at cheap prices?

  7. WoW, wow, wow. Just stunning. I do have a question and hope you can answer. I live in New Zealand and have not found anywhere that sells a quickmix concrete. Can I use and ordinary cement?

    1. I would have a chat with the sales associate at a good builder supply. You want a fast-setting mix that has no aggregate in it! The other mixes are just not fine enough either. I am pretty sure every country has their version. Perhaps someone can help??? Here is what I found in my search, but ask a sales person; sounds possible.