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Five Tiers, Five Items
Library Ferret's entire registry is five coins: 
Iron Coin, 
Gold Coin, 
Emerald Coin, 
Diamond Coin, and 
Netherite Coin. There is no sixth tier and no separate currency block, so the tier list is simply these five names.
Reading the Tier Order
Order them by the rarity of their source material:
- Iron Coin — lowest tier, iron is abundant.
- Gold Coin — next step up, gold is common but less so than iron.
- Emerald Coin — mid tier, gated behind villager trading or mountain mining.
- Diamond Coin — high tier, requires diamond gear-level mining.
- Netherite Coin — highest tier, requires netherite and the Nether.
How to Climb the Tiers
1. Start by producing Iron Coin and Gold Coin from 
early-game materials.
2. Move to 
Emerald Coin once you have a steady emerald supply.
3. Push into Diamond Coin when diamond mining is routine.
4. Finish with Netherite Coin, which sits at the top because netherite is the rarest input.
Why the Order Matters
Because each coin is a standalone registry item, you cannot skip a tier by upgrading a lower coin in place. You produce each coin from its own matching material. Plan your mining and trading around the specific tier you are targeting, and keep the higher coins — Diamond Coin and Netherite Coin — set aside once crafted.
