RuneScape Classic Wiki
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RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Jade
The Old School RuneScape Wiki also has an article on Jade.

A Jade is a semiprecious gem made by using a chisel on an uncut jade for 20 Crafting experience. This item is used the Legends' Quest. It has no other use in RuneScape Classic.