Tortoise shell

Tortoise Shell is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "A word in your shell-like."

It has a Grand Exchange buy limit of 7,500 every four hours, a high alchemy value of 600 gp, and item ID 7939.

View on OSRS Wiki

Tortoise Shell shows an active flip setup with a margin of +1.7k gp and 1,460 trades over the last 24 hours.

At the buy limit of 7,500 every four hours, max profit per cycle is about 13.06m gp — high margin with healthy liquidity.