Emerald

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

In-game examine text: "This looks valuable."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 300 gp, and item ID 1605.

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Emerald currently has a flip margin of −3 gp, which isn't profitable to flip right now despite 1,666,855 trades over the last 24 hours.

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