Coconut

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

In-game examine text: "It's a coconut."

It has a Grand Exchange buy limit of 11,000 every four hours, a high alchemy value of 52 gp, and item ID 5974.

View on OSRS Wiki

Coconut shows an active flip setup with a margin of +18 gp and 826,282 trades over the last 24 hours.

At the buy limit of 11,000 every four hours, max profit per cycle is about 198.0k gp — high margin with healthy liquidity.