Stone seal

Stone Seal is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "A seal. Made out of stone obviously."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 12 gp, and item ID 9042.

View on OSRS Wiki

Stone Seal shows an active flip setup with a margin of +85 gp and 20,959 trades over the last 24 hours.

At the buy limit of 13,000 every four hours, max profit per cycle is about 1.10m gp — high margin with healthy liquidity.