Limestone brick

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

In-game examine text: "A well carved limestone brick."

It has a Grand Exchange buy limit of 10,000 every four hours, a high alchemy value of 12 gp, and item ID 3420.

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Limestone Brick currently has a flip margin of −3 gp, which isn't profitable to flip right now despite 21,096 trades over the last 24 hours.

Items with negative or zero margins like this are better watched than actively flipped until the spread widens.