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* https://www.gemsociety.org/article/standard-gem-sizes-chart/
* https://www.diamondnexus.com/product-education-mm-to-catat-weight-conversion.html
== Light ==▼
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 [[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 sphere would consider them superior. 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.{{book ref|sa1|3}} The color of the spherelight also changes from sphere to sphere, but only because any light filtered through differently colored gemstones would produce differently colored light. Famously, spherelight from diamonds is considered best for reading,{{book ref|sa1|8}} as it is not only closest to natural light, it is also the cheapest gemstone. All spherelight, although reputably steady and calm, is only so in comparison to the even more flickering candlelight; [[Kaladin]] observes that the Stormlight inside sphere gemstones is actually chaotically shifting, much like a blowing storm.{{book ref|sa2|22}}
Although spheres are generally a superior source of light, many people, especially those less well-off or living in poorer
The table below lists all ten sphere types along with the spherelight color they emit.
{| class="infobox" style="margin: auto;"▼
|+ Spherelight colors▼
{{row| Emerald | Deep green |}}▼
{{row| Heliodor | Light yellow |}}▼
|}{{cite}}▼
== Currency ==
{{row| Highest | 50 | 250 | 1000 | Emerald }}
|}
▲== Light ==
▲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.{{book ref|twok|33}}
▲{| class="infobox" style="margin: auto;"
▲|+ Spherelight colors
▲|}{{cite}}
▲{{row| Gem type | Color | pre=! width=25% style="font-weight: bold;" {{!}} }}
▲{{row| Sapphire | Deep blue |}}
▲{{row| Smokestone | Deep gray |}}
▲{{row| Ruby | Deep red |}}
▲{{row| Diamond | Light gray |}}
▲{{row| Emerald | Deep green |}}
▲{{row| Garnet | Light red |}}
▲{{row| Zircon | Light blue |}}
▲{{row| Amethyst | Light red |}}
▲{{row| Topaz | Deep yellow |}}
▲{{row| Heliodor | Light yellow |}}
== Spheres as Investiture ==
| |||