Method 1: Crafting Table
Place 3 Diorite in a Crafting Table to make 6 Diorite Slabs.
6 How to Make a Diorite Slab in Minecraft
Use this simple recipe to make a Diorite Slab in Minecraft. You can see the exact ingredients, recipe layout, and workstation below.
Diorite Slab recipe
Follow the recipe below. The pattern must use the correct slots when the recipe is shaped.
6 
Method 2: Stonecutter
Use 1 Diorite in a Stonecutter to make 2 Diorite Slabs.
2 About this Minecraft recipe
This page shows the vanilla recipe for Diorite Slab. It includes the exact ingredients, recipe layout, required workstation, and amount produced.
The data comes from Minecraft Java 26.2. Recipes can change in later game versions, so check the version you play before crafting.