Tiara

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

In-game examine text: "Makes me feel like a Princess."

It has a Grand Exchange buy limit of 10,000 every four hours, a high alchemy value of 60 gp, and item ID 5525.

View on OSRS Wiki

Tiara shows an active flip setup with a margin of +15 gp and 220,977 trades over the last 24 hours.

At the buy limit of 10,000 every four hours, max profit per cycle is about 150.0k gp — high margin with healthy liquidity.