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|books= [[The Stormlight Archive]]
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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}}
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?}}
Although the type of polestone Stormlight is stored in is irrelevant for most [[Surgebinding]], polestones do have an important impact on Soulcasting. Namely they determine what objects can be Soulcast into.{{qa ref|985|4|Why Can Kaladin Surgebind with any gem type but Jasnah and Shallan need specific types?}}
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==Ten Polestones==
===Sapphire===
'''Sapphire''' is associated with the Essence of Zephyr. They are used to Soulcast translucent gases, like air.
Sapphire spheres are given the "sky-" prefix.{{book ref|sa1|27}}
===Smokestone===
===Ruby===
'''Ruby''' is associated with the Essence of Spark. They are used to Soulcast fire.
Ruby spheres are given the "fire-" prefix.{{book ref|sa1|3}}
===Diamond===
'''Diamond''' is associated with the Essence of Lucentia. They are used to Soulcast crystals, like quartz, and glass.
Diamond spheres are given the "clear-" prefix.{{book ref|sa1|11}}
===Emerald===
===Garnet===
'''Garnet''' is associated with the Essence of Blood. They are used to Soulcast the eight types of blood and all other non-oil liquids.
Garnet spheres are given the "blood-" prefix.{{book ref|sa1|17}}
===Zircon===
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