Amulet mould

Amulet Mould is a free-to-play item on the OSRS Grand Exchange in the other category.

In-game examine text: "Used to make amulets."

It has a Grand Exchange buy limit of 40 every four hours, a high alchemy value of 3 gp, and item ID 1595.

View on OSRS Wiki

Amulet Mould shows an active flip setup with a margin of +322 gp and 639 trades over the last 24 hours.

At the buy limit of 40 every four hours, max profit per cycle is about 12.9k gp — high margin with healthy liquidity.