The Stonemason is part of your colony’s crafting line. The Stonemason can craft items and blocks made entirely out of cobblestone, stone, andesite, diorite, granite, quartz, nether bricks, purpur, prismarine, sandstones, blackstone, basalt, and/or ores (no ingots or redstone items). They can also craft end stone from cobblestone and an ender pearl, but only if you have completed the Know the End research in the University. The Stonemason will only make items when they have been taught the recipes, receive a request for an item, and have the needed materials.
Note: The Stonemason can only learn a set number of recipes based on their hut level. So:
All crafters have a chance to decrease the amount of materials needed for a taught recipe. (If this happens, the new recipe is kept until deleted or improved again.) The higher a Stonemason’s Creativity level, the greater their chance to decrease the amount of materials needed.
The Stonemason will craft faster with a higher Dexterity level.