Diamond Nugget and Raw Diamond (and emerald, amethyst, quartz) don’t really make sense.

You should rename/retexture the gem variants so that you have diamond chips instead of nuggets, rough diamonds instead of raw diamonds, etc.

Also, if the rock tumbler were a full block (or at least had a simpler design) it would better fit the vanilla style, though I understand if that isn’t a priority

By the way, I think it would make sense if the block of Netherite Scrap looked more similar to Ancient Debris (different top/bottom, for example)