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{{culture
|image=Emerald sphere.jpg
|type={{cat tag|Currencies|Currency}}
|world=Roshar
|universe=[[Cosmere]]
}}{{spoilers|book=sa3}}
'''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
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== Appearance ==
{| class="wikitable floatleft" style="margin-right:1em;"
{{row| Sphere gemstone measurements | pre=! colspan=4 style="background:#CCCCFF; font-weight:bold; text-align:center;" {{!}} }}
{{row
| Denomination
| Mass <br>(carats, ct)
| Mass <br>(milligrams, mg)
| Diameter <br>(millimeters, mm)
| pre=! style="font-weight:bold; text-align:center;" {{!}}
}}
{{row| Chip | 0.1{{wob ref|10400}} | 20 | 3{{ref|name=igs}}{{ref|name=diamondnexus}} | pre={{!}} style="text-align:center;" {{!}} | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
{{row| Mark | 0.5{{wob ref|10400}} | 100 | 5{{ref|name=igs}}{{ref|name=diamondnexus}} | pre={{!}} style="text-align:center;" {{!}} | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
{{row| Broam | 2.0{{wob ref|10400}} | 400 | 8{{ref|name=igs}}{{ref|name=diamondnexus}} | pre={{!}} style="text-align:center;" {{!}} | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
|}
Each sphere is made of a tiny gemstone encased in a glass bead that is usually flattened on one side to keep the sphere from rolling away when set down.{{book ref|sa1|27}} The gemstone can belong to any one of the ten [[Polestone]]s{{wob ref|10402}} and can come in one of three different sizes. The glass bead is always a uniform size, a little larger than a person's thumb nail.{{book ref|sa1|3}}
Exact measurements for the glass beads or their embedded gemstones are not available, but they can be deduced from the known weights of each denomination's gemstone. Spheres gemstones come in three different sizes (see [[#Currency]] for more information), so taking the largest one - the one in the broam - allows for some reasonable estimates. The broam gemstone is about 8mm in diameter, assuming a uniform round cut.{{url ref|name=igs}}{{url ref|name=diamondnexus}} The distance between the thumb's fingertip and its first joint is about an inch{{url ref|name=lat}} (or 25.4mm), with the nail being roughly half of that, so a nail size of about 12mm is reasonable. Shallan's comment about spheres being slightly larger than a person's thumb nail suggests that spheres are likely in the neighborhood of 15mm to 20mm in diameter.
The table to the left presents the mass and diameter of the gemstone in each denomination, assuming a uniform round cut.
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== Light ==
{| class="wikitable floatright" style="margin-left:1em;"
! colspan=3 style="background:#CCCCFF; text-align:center;" | '''Spherelight colors'''{{wob ref|10402}}
{{row| Gem type | Color | pre=! style="text-align:center; font-weight: bold;" {{!}} | pre2=! colspan=2 style="text-align:center; font-weight: bold;" {{!}} }}
{{row| Sapphire | Deep blue | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#00008B;" {{!}} }}
{{row| Smokestone | Translucent | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#FFFFFF;" {{!}} }}
{{row| Ruby | Deep red | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#8B0000;" {{!}} }}
{{row| Diamond | Transparent | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#FFFFFF;" {{!}} }}
{{row| Emerald | Deep green | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#006400;" {{!}} }}
{{row| Garnet | Deep violet | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#9400D3;" {{!}} }}
{{row| Zircon | Pale blue | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#ADD8E6;" {{!}} }}
{{row| Amethyst | Pale violet | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#EE82EE;" {{!}} }}
{{row| Topaz | Pale orange | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#FFA500;" {{!}} }}
{{row| Heliodor | Light yellow | | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} | pre3={{!}} style="background:#FFFFE0;" {{!}} }}
|}
Perhaps the most common use of the spheres is as a light source. Since the gemstones inside them have the ability to hold Stormlight, many Rosharans have adopted the habit of leaving their spheres out during highstorms (in cages or baskets, so they don't get lost or stolen) so they can get (re)charged. Much like the highstorms, Surgebinders are also able to recharge spheres, similarly to how Awakeners can store their Breaths in objects; the Surgebinder must already be Invested, at which point they can will some of their own Stormlight into a gem or sphere. Spheres are leaky containers for Stormlight, however (unlike the [[Polestone#Perfect_Gemstones|perfect gemstones]]), so they slowly lose their Stormlight to a process similar to evaporation. It takes several days for newly infused spheres to lose all of their Stormlight and become dun, though this amount of time varies slightly with the denomination of the spheres.
Due to this property of gemstones, infused spheres often serve as a replacement for other, more traditional light sources, such as candles and lanterns. Given that spherelight is both steadier and more consistent,{{book ref|sa1|23}} as well as being practically infinitely renewable, it is easy to see how people with access to
Although spheres are generally a superior source of light, many people, especially those less well-off or living in poorer regions, still use candles or lanterns. Using candles and lanterns is often cheaper than using spheres, since a sphere's dual status as currency makes it liable to be stolen.{{book ref|sa1|23}} This problem does not exist for wealthy or noble [[lighteyes]] who may use all-sphere lighting either as a practical matter or to show off their wealth. For example, the entirety of [[Kharbranth]]'s royal treasury is stored in the [[Palanaeum]] to be used as a source of light for the visitors and staff.{{book ref|twok|33}}
The table
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== Currency ==
The monetary value of each sphere is a direct consequence of causes both mundane (the size of the sphere's gemstone) and arcane (the [[Soulcasting]] properties of each gem type). The gem size defines the denomination of the sphere. From smallest to largest, these are chip, mark, and broam. The gem type is applied as a qualifier to the denomination (e.g. diamond chip, or emerald broam) to form the thirty different monetary units of Roshar.
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
The dominance of spheres throughout Eastern Roshar is slightly weaker in the West. The [[Tashikki]], for example, still use spheres, but instead of carrying them in pouches, they drill holes in the glass beads and keep them on long strings.{{book ref|sa2.5|6}} People even farther west don't even bother with spheres, but use chips of gemstones instead, though they are sometimes encased in hunks of glass.{{book ref|sa2.5|6}}
For details about using spheres as a currency in Shadesmar, see [[#Shadesmar Currency|Shadesmar Currency]].
The economic value of each sphere is determined by the type and size of its gemstone.
The gem size defines the three denominations of spheres (chip, mark, and broam), and therefore a fixed exchange rate between the different denominations of spheres of the same type. Within the same gem type, each broam is equivalent to four marks,{{
The gem type is a little more complicated. The value of each type of sphere - and, therefore, the relative
{| class="
{{row| Sphere values{{wob ref|10402}} | pre=! colspan=5 style="background:#CCCCFF; text-align:center; font-weight:bold;" {{!}} }}
{{row| Tier | Value (chip) | Value (mark) | Value (broam) | Spheres | pre=!
{{row| Cheapest | 1 | 5 | 20 | Diamond | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
{{row| Less weight | 5 | 25 | 100 | Garnet, heliodor, topaz | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
{{row| Middle weight | 10 | 50 | 200 | Ruby, smokestone, zircon | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
{{row| Prime pair | 25 | 125 | 500 | Amethyst, sapphire | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
{{row| Highest | 50 | 250 | 1000 | Emerald | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
|}
<!-- TODO: This section needs to be hidden until we actually create the relevant page.
=== Cost of Goods and Services ===
Despite many of the spheres having identical values, prices on Roshar do not reflect that explicitly. It appears that Rosharans have an unspoken understanding about the equivalencies within the value tiers, as the question whether amethysts (for example) would be accepted for an item that costs sapphires never comes up.
For a full list of the known prices of goods and services, see '''this page'''.
==
As useful as spheres are in the everyday life of most Rosharans, their property of holding Investiture in the form of Stormlight is especially useful to a
=== Surgebinders ===
For Surgebinders - including both pre-Recreance [[Knights Radiant]] and [[Dalinar]]'s newly
In the days after [[Kaladin]]'s promotion to a captain in [[Dalinar]]'s army, [[Sigzil]] attempts to establish a baseline for how efficient Kaladin's use of a [[Surgebinding#Full_Lashing|Full Lashing]] is by measuring the amount of time it takes for a stone of unspecified size to run out of Stormlight, first with [[Rock]] hanging from it (20 seconds), then by instructing Kaladin to use only the Light from a single diamond chip and letting the stone fall on its own (about 87-91 seconds). Sigzil's experiments don't progress much further than that, unfortunately, so better data is still unavailable.
=== Shadesmar Currency ===
Similarly to how spheres have become the dominant currency in the [[Physical Realm]] of Roshar, they have become prevalent in its [[Cognitive Realm]] as well - though for slightly different reasons. In the Physical Realm the value of each sphere is determined primarily by the economic value of its gemstone, as it relates to Soulcasting. In Shadesmar, however, the real currency is the Stormlight, and spheres become only as valuable as the amount of Stormlight they hold at the moment of the transaction. Presumably out of convenience, prices are still communicated in terms of the sphere denominations defined in the Physical Realm, but the gemstone type becomes irrelevant; a freshly infused diamond mark has the same value in Shadesmar as a freshly infused emerald mark - they are both "one mark of Stormlight," even though in the Physical Realm emeralds are fifty times more expensive than diamonds.
For reasons not yet known, Stormlight fades more quickly in Shadesmar than it does in the Physical Realm,{{book ref|sa3|99}} which has led to the development of alternative ways of transporting and transferring Stormlight. The moneychangers in [[Celebrant]], for example, have devices they can use to transfer Stormlight from regular spheres and gemstones into their [[perfect gem]]s{{book ref|sa3|99}} (where it won't fade). In return, they give out notes of exchange{{book ref|sa3|101}}, which can be spent like credits within the city's limits.{{book ref|sa3|99}} The [[Rii Oracle]] possesses a device similar to what the Celebrant moneychangers use, but [[Ico|Captain Ico]] calls it "foreign technology."{{book ref|sa3|99}}
Neither the full breath nor depth of the usefulness of Stormlight in Shadesmar is currently known, but it appears to be even more valuable there than it is in Physical Realm. While it can serve as a regular currency, exchanged for items as mundane as clothes and as exotic as a painting from [[Nalthis]]' [[Court of Gods]],{{book ref|sa3|102}} it can also help spren change appearance{{book ref|sa3|103}}, though perhaps most importantly, it can aid in manifesting souls{{book ref|sa3|99}} -- a skill that seems invaluable for the survival in Shadesmar.
== Informal Names ==
Spheres are
{| class="
{{row| Informal names | pre=! colspan=3 style="background:#CCCCFF; font-weight:bold; text-align:center" {{!}} }}
{{row|
{{row| Diamond | Clearchip{{book ref|sa2|43}} | Clearmark{{book ref|sa1|11}} | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
{{row| Garnet | Bloodchip
{{row| Ruby | Firechip
{{row| Sapphire | Skychip{{book ref|sa1|55}} | Skymark{{book ref|sa1|8}} | pre1={{!}} style="text-align:left; font-weight:bold;" {{!}} }}
|}
== Notes ==
<references
{{url ref|name=igs|url=https://www.gemsociety.org/article/standard-gem-sizes-chart/|text=International Gem Society: Standard Gem Sizes Chart|site=IGS|date=2018-07-01}}
{{url ref|name=diamondnexus|url=https://www.diamondnexus.com/product-education-mm-to-catat-weight-conversion.html|text=Diamond Nexus: MM to carat weight conversion values|site=Diamond Nexus|date=2018-07-01}}
{{url ref|name=lat|url=http://articles.latimes.com/1996-04-13/home/hm-58312_1_measuring-tools|text=Los Angeles Times: Measuring Up Without Ruler|site=Los Angeles Times|date=1996-04-13}}
</references>
{{partial}}{{edit note|date=2018-06-30|claim=Argent}}
{{Stormlight}}
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