Demon tear

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

In-game examine text: "A strange glowing tear."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 300 gp, and item ID 31111.

View on OSRS Wiki

Demon Tear shows an active flip setup with a margin of +4 gp and 15,739,723 trades over the last 24 hours.

At the buy limit of 13,000 every four hours, max profit per cycle is about 52.0k gp — high margin with healthy liquidity.