Carefully cut the block of transparent glycerin into chunks with a sharp knife. Put pieces into a microwave-safe bowl and heat. Keep an eye on it since it only takes seconds. 

Pour a thin layer of melted clear soap into your mold, and leave the rest of the liquid in the bowl. Let the soap harden and cool in the mold.

Texturize the surface of the hardened layer by lightly scratching with a fork. This helps the layers stick together.

Reheat the bowl with the glycerin since it's probably started to thicken at this point. Stir in your choice of essential oils and food coloring. This will be your second layer, so don't make it too dark.

Spray rubbing alcohol on the first layer before pouring the second layer. Pour the second layer and let harden.

Reheat the leftover soap again if needed. Add more coloring to deepen the color. This is your third and darkest layer.

Scratch the surface of the second layer and spray with alcohol before pouring the third layer.

Allow to cool completely before popping out of the mold. Take your three-layer soap creation and cut it into slices. Cut the clear ends at an angle to create triangle shapes. Slice into smaller pieces that start to resemble crystals.

Continue cutting to shape your crystals into unique pieces. Save all of the tiny soap scraps. Cut them into even smaller pieces. Take more chunks off the clear glycerin and heat it.

Pour a thin layer into the mold. Quickly add in the tiny scrap pieces of soap first. Add the crystal pieces before the soap hardens.

Let everything cool and harden completely before removing from the mold.