Editors, Keepers
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{{row/kv|Books|''[[The Stormlight Archive]]''}}
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'''Spheres''' are the primary currency in most nations on [[Roshar]]. Each one consists of a [[gemstone]] encased in a glass bead. Gemstones, including the ones in spheres, can temporarily hold [[Investiture]] in the form of [[Stormlight]], offering both a source of light{{book ref|sa1|3}} and fuel for [[fabrial]]s{{cite}} and [[Surgebinding]]s.{{cite}} Like all gemstones, spheres naturally leak any Stormlight they have absorbed, over several days{{book ref|sa3|99}} - with larger denominations taking slightly longer.{{cite}} This has led to the practice of leaving spheres out in baskets and cages during highstorms so they can be recharged. The Rosharan terms for spheres full and empty of Stormlight are ''infused'' and ''dun'' respectively.
== Currency ==
The monetary value of each sphere is a direct consequence of causes both
One property of Rosharan spheres that does not affect their value is whether they are infused or dun.{{book ref|twok|17}} However, since the glow from the Stormlight is the easiest way to prove that a sphere is not a counterfeit, people are sometimes suspicious of dun spheres and those who try to spend them. Merchants with access to the proper equipment may inspect the gem quality of dun spheres to ensure their authenticity, or call for a moneylender.{{book ref|twok|3}} Moneylenders serve an additional purpose in Rosharan societies, and that is to offer infused spheres in exchange for dun ones, since an established moneylender usually has access to secure baskets they can safely recharge spheres in. They can extend this service to people interested in recharging their own spheres safely, though this comes with a small convenience fee.{{book ref|twok|11}}
=== Value ===
The economic value of each sphere is determined by the type and size of the gem encased by the glass bead.
The gem type works a little more complexly. The value of each type of sphere - and, therefore, the relative value of all types - is intrinsically tied to how valuable the given gem is in Soulcasting. This makes emeralds -- which can be used to Soulcast grain -- the most expensive kind of sphere,{{book ref|twok|3}} while diamonds are the cheapest. The rest of the sphere types, however, don't all have unique values; instead, they fall within one of three tiers: '''prime pair''', '''middle weight''', and '''less weight'''. Combined with the emerald and diamond spheres, this establishes a system with five distinct value tiers. The table below outlines the five tiers, lists the sphere types within each tier, and provides their monetary value expressed in '''diamond chips''', the smallest denomination of the least valued gemstone.
{| class="infobox" style="margin: auto;"
|+ Sphere values
{{row| Tier | Value (chip) | Value (mark) | Value (broam) | Spheres |pre=! width=25% style="font-weight: bold;" {{!}} }}
{{row| Cheapest | 1 | 5 | 20 | Diamond }}
{{row| Less weight | 5 | 25 | 100 | Garnet, heliodor, topaz }}
{{row| Middle weight | 10 | 50 | 200 | Ruby, smokestone, zircon }}
{{row| Prime pair | 25 | 125 | 500 | Amethyst, sapphire }}
{{row| Highest | 50 | 250 | 1000 | Emerald }}
{| class="infobox" style="margin: auto;"
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