'''Spheres''' are the[[gemstones]] majorencased units of currencyin usedglass on [[Roshar]]. They comeserve inas threethe denominations:primary chipsform of currency, marksact as a light source, and broams.store In addition[[stormlight]] to theirpower use[[shard as currencyplate]], they[[fabrial]]s areand also[[surgebinding]]. usedThey asare acharged magicalby source[[highstorm]]s ofand lightgradually toleak replacethe or[[investiture]] supplementas candleslight andover lanternstime.