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{{culture
|related=[[Spheres]]<br/> [[Soulcasting]]<br/> [[Fabrial]]s
|world=Roshar
|universe=[[Cosmere]]
|books=[[The Stormlight Archive]]
}}
{{update|sa4}}
The '''Polestones''' are the ten varieties of gemstone that naturally hold [[
== Attributes ==
=== Composition ===
Some
If sung to, while holding Light, Polestones will break.{{book ref|sa4|86}}
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 kind of substances a Soulcaster can transmute objects into.{{wob ref|2784}} It is believed to be impossible to create polestones via Soulcasting.{{book ref|sa1|33}}▼
=== Light and Surgebinding ===
If a polestone is set in the pommel of a deceased [[Shardblade]] it allows the blade to be bonded, whereby it can be summoned and dismissed.{{book ref|sa2|67}} Synthetic versions of the polestones could also be used in fabrials.{{wob ref|2702}}▼
All Lights can be stored in gems. How long a given quantity of Light will remain in a specific gem depends on the type of Light and the quality of the gem.{{book ref|sa4|16}} The rate at which a Light leaks from gemstones is not constant either - it appears slow at first, but accelerates rapidly near the end, making gems that begin to dim, dim ''fast.''{{book ref|sa4|32}} Regardless of the type of Light, perfect gems are said to be able to hold it indefinitely, but they are extremely rare.{{book ref|sa4|13}}
▲Although the type of
=== Spren ===
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.{{ref|name=Navani1}} Each Polestone is associated with one of the [[Ten Essences]] and with an Order of [[Knights Radiant]].{{book ref|sa1|part=ars}} However, there appears to be no functional difference between Polestones apart from [[Soulcasting]] and fabrial creation.
▲If a
== The Ten Polestones ==
=== Smokestone ===
'''Smokestone''' is associated with the Essence of Vapor. They are used to Soulcast opaque gases, like smoke and fog.{{book ref|sa1|part=ars}}
Smokestones are used in a type of fabrial clock.{{book ref|sa1|10}}
It is associated with the [[Order_of_Skybreakers|Order of Skybreakers]].
Smokestone is a chemically impure version of quartz.{{wob ref|3813}}{{ref|group=fn|text=It can be reasonably assumed that smokestone is [[wikipedia:Smoky quartz|Smoky quartz]], a form of quartz turned a dark grey due to aluminum impurities within the crystalline quartz. This is confirmed due to the fact that Brandon confirms that smokestone is an impure form of quartz.{{wob ref|3813}}}}
=== Ruby ===
=== Diamond ===
'''Diamond''' is associated with the Essence of Lucentia. They are used to Soulcast crystals, like quartz
Diamonds are used in a kind of light producing fabrial.{{book ref|sa2|86}}
'''Emerald''' is associated with the Essence of Pulp. They are used to Soulcast plant material, like wood, moss, and grain.{{book ref|sa1|part=ars}}
Emeralds can be used to capture flamespren.{{ref|name=Navani1}} They can be found in [[chasmfiend]]s.
It is associated with the [[Order_of_Truthwatchers|Order of Truthwatchers]]
It is associated with the [[Order_of_Bondsmiths|Order of Bondsmiths]]
They can be found in [[gumfrem]]s.{{book ref|sa3|10}}
== Obtaining ==
While
== Perfect Gemstones ==
'''Perfect gemstones''' occur when one of the
Perfect gemstones have the capacity to hold [[Cognitive Shadow]]s in addition to spren, the latter of which they have a far larger capacity than normal gemstones--they can hold [[Herald]]s, the [[Unmade]], and even [[Fused]].{{book ref|sa3|120}}{{book ref|sa3|121}}{{book ref|sa4|14}} They could also capture some of the [[Dor]] or the sunlight from [[Taldain]].{{wob ref|15297}}
== Transfer ==
It is possible to transfer
Surgebinders are also able to infuse Polestones regardless of the type, and can do so very quickly.{{book ref|sa4|44}}{{book ref|sa4|49}}
== Roshar Economy ==
{{for|Spheres}}
Gemstones form the basis for the Roshar economy. Gemstone weight is measured in kivs.{{book ref|sa4|42}} When used as currency, the gems are encased in glass [[spheres]]. Although the spheres are of uniform size, the gemstones inside are of three sizes.{{book ref|sa1|3}} In descending order of size (and value), these gem sizes are broam, mark, and chip.{{book ref|sa1|3}}
In addition, the value of the “sphere” is determined by the type of gemstone, which have different values as determined by their utility rather than their rarity.{{book ref|sa3|part=ars}}. Their relative value in descending order is as follows: emerald, sapphire,{{book ref|sa1|8}} ruby,{{book ref|sa3|7}} diamond, and garnet.{{book ref|sa1|17}} In addition, amethyst is one of the more valuable gemstones;{{book ref|sa2|9}} topaz{{book ref|sa1|30}} and zircon are amongst the least valuable.{{book ref|sa1|55}}
== Notes ==
;Footnotes
<references group=fn />
; References
<references>
</references>
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