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{{culture
|related= [[Spheres]]<br> [[Soulcasting]]
|world= Roshar
|books= [[The Stormlight Archive]]
}}
The '''Polestones''' are the ten varieties of gemstone that naturally hold [[Stormlight]]. They also serve as the basis of [[spheres]], the basic Rosharan money system.{{book ref|sa1|3}}
In addition to the ability to hold Stormlight, polestones are able to trap [[spren]]. The type of spren that can be trapped depends on the polestone used and its cut. This quality serves as the basis for [[fabrial]]s.{{file ref|Navani1.jpg|text=Navani's Notebook: One}}
Some polestones are the same type of crystal but with different color and chemical signatures. Sapphire and Ruby are both types of corundum. Smokestone and Amethyst are both types of quartz. Emerald and Heliodor are both types of beryl. Much like how [[iron]] and [[steel]] are different metals in the [[Metallic Arts]], the exact color and chemical signatures are the determining factor. As a result an off-color polestone acts much like an impure alloy in [[Allomancy]].{{qa ref|979|97|What is the dividing line between gemstones?}}
===Emerald===
'''Emerald''' is associated with the Essence of Pulp. They are used to Soulcast plant material, like wood and moss.
Emeralds can be used to capture flamespren.{{file ref|Navani1.jpg}}
===Garnet===
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