Kidney 24″x32″x2″
March 15, 2019
Gable 25″x30″x2″
March 15, 2019

Oyster Shell 24″x32″x3″


SKU: GS-2432-3 Categories: ,

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Make these giant stones for as little as $0.35 – $0.65 a square foot!

The “GS” stands for “Giant Stone.” The next four numbers are the nominal size of the mold/stone. And the last number (after the dash), is the depth of the mold at the deepest point, which equates to the thickness of the stone made. So GS-2533-2 is a mold that is 25″x33″x2”. Remember that you can pour the stones thinner to save on concrete, or to make a thinner “veneer” stone.

These molds are made with .093, high-impact, commercial, rubberized ABS plastic, for flexibility and long life, and can be used hundreds of times if cared for properly. This is not our normal .060 ABS. This is mainly due to the mold size and weight when made. They require a much thicker and heavier ABS to make the stones that you can be proud of and to last through hundreds of pours.


  1. Lubricate the molds…a light vegetable oil will do if you don’t have mold release.
  2. Mix a bag of pre-mix concrete…get a shovel, water, and something to mix it in.
  3. Add some concrete color, which is optional…unless you want just plain gray.
  4. Pour mix into molds…vibrate a bit to compact concrete and release air bubbles.
  5. Let the filled molds sit a day or so, undisturbed…over-night is fine.
  6. Carefully flip the molds over the next day…and pop out what you’ve created from the mold!

That is obviously a simplified version of the process, but it is that easy. And FREE instructions and email support are included with each purchase.


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