Spheres

Spheres
Type	Currency
World	Roshar
Books	The Stormlight Archive

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Spheres are the major units of currency used on Roshar. They come in three denominations: chips, marks, and broams. In addition to their use as currency, they are also used as a magical source of light to replace or supplement candles and lanterns.

Appearance

Spheres are made of small gemstones that are set inside glass spheres. The glass sphere is typically the size of a thumbnail while the size of the gemstone inside varies with the denomination. Most spheres are also flattened on one side, to keep them from rolling away when set down. Since gemstones can capture stormlight and glow with this captured light, spheres, by extension, also glow with light.

Only nine of the ten Polestones are used in the spheres, but it is as of yet unknown whether smokestones or heliodor are the gem not used, or the reason for the tenth gem's absence.

Usage as source of light

If left outside during a highstorm, the gemstone inside of a sphere is infused with Stormlight. Over time, all of the Stormlight will escape leaving the sphere dun, so it ceases to glow. The amount of light a sphere gives off varies with the denomination: chips barely have any glow at all, marks glow almost as bright as a candle, and broams glow with the light of several candles.

Due to this property of gemstones, infused spheres are often used as a source of light, since the light is renewable and more consistent than candles and lanterns. Though the light given off by a gemstone is reputed to be steady and calm, this is only in comparison to the even more flickering candlelight; Kaladin observes that the Stormlight inside of a gemstone is actually shifting like a chaotic blowing storm.

Although spheres are generally a superior source of light, many people, especially those less well-off or living in poorer districts, 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. 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.

Usage as currency

Dun spheres are worth the same as infused ones but since their glow is what proves that they aren't counterfeit, people are often suspicious of those spending dun spheres. They will call in a moneylender to judge their authenticity. Instead of just leaving their spheres out in a highstorm, people often exchange their dun spheres with moneylenders for infused ones or pay a fee to have their spheres infused in the moneychanger's secure baskets.

Value

There are five chips to a mark and four marks to a broam. A higher denomination has a larger gemstone inside of it. However, the kind of gemstone set inside the sphere also determines the value of the sphere. This is related to the fact that magic such as Soulcasting uses gemstones in the process; emerald, the most highly valued sphere, can be used to Soulcast food. There are currently five known values of spheres (and by extension, five known gemstones used in spheres), with some combinations of denomination and gemstone overlapping in value.

Below is a table of all currently-known spheres, with their value given in terms of a diamond chip, the lowest denomination of the lowest-valued gemstone.

Gem type	Chips	Marks	Broams
Diamond	1 diamond chip	5 diamond chips	20 diamond chips
Garnet	5 diamond chips	25 diamond chips	100 diamond chips
Ruby	10 diamond chips	50 diamond chips	200 diamond chips
Sapphire	25 diamond chips	125 diamond chips	500 diamond chips
Emerald	50 diamond chips	250 diamond chips	1000 diamond chips

Notes

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