Crushed gem The RuneScape Wiki
A crushed gem is an accidental product that is occasionally made when using a chisel (in the inventory or tool belt) on an uncut semiprecious gem, such as opals, jades, and red topazes. 5 Crafting experience is granted when a gem is crushed this way (3.8 for uncut opal). Gems can also be deliberately crushed by using a hammer on a semiprecious gem.
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