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

An Uncut Jade is a semiprecious gem that can be obtained either by panning at the Digsite or Mining gem rocks in Shilo Village (the quest must be completed to mine there).

It can be cut unto a jade by using a chisel on it giving 20 Crafting experience. There is a chance that you will crush the gem in the process leaving you with a Crushed Gemstone and giving only 5 crafting experience instead. This item is used in the Legends' Quest.

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