Amalgamagic
Improve your forging game by acquiring 9 or 75 of the same item from the list below and merging them with a suitable catalyst (1x crystaline dust or 5x glob of ectoplasm) in the Mystic Forge. Profit from the sale of the resulting amalgamated gemstones on the Trading Post. For a comprehensive understanding of this procedure, consult the wiki on any of the items mentioned below related to mystic forging.