Crystal weapon seed

Crystal Weapon Seed is a members-only item on the OSRS Grand Exchange in the seeds category.

In-game examine text: "A seed to be sung into the finest crystal weapons."

It has a Grand Exchange buy limit of 70 every four hours, a high alchemy value of 1 gp, and item ID 4207.

View on OSRS Wiki

Crystal Weapon Seed shows an active flip setup with a margin of +7.5k gp and 1,938 trades over the last 24 hours.

At the buy limit of 70 every four hours, max profit per cycle is about 525.9k gp — high margin with healthy liquidity.