First entered into circulation in 190 AL, quartz discs function as a physical interface within Uji’s digital quartz economy. Prior to their invention, quartz existed solely as physical gemstones, typically clear to purplish in hue.

During the two-cycle transition mandated by The Quartz Depository Law (ordained under Chief Wen, 182AL–200AL), all quartz were digitised and made accessible through biometric-linked depository accounts. This shift was enabled by the Lei Electronics development of biometric palm-scanning technology. In response, Tassan Electronics introduced ‘The Quartz Disc’ — portable digital wallets engraved with groove patterns designed to replicate palm-print identification.

Unlike biometric-linked Depository Accounts, quartz discs are unregistered, disposable, and fully portable, operating as decentralised wallets. Their introduction eased public concern during the digitisation period, allowing value to be stored, transferred, and exchanged without identification.

As trust in Government depositaries increased, quartz discs gradually fell out of common circulation. In the Modern Era, they are most often used for gift-giving, discreet trade, and other non-institutional transactions. Notably, within City Korai, quartz discs are commonly used to grant limited economic freedom to Korainians without biometric accounts (particularly those under eleven cycles of age).

The underlying technology also persists in the form of Security Discs, which provide temporary access across various applications, most notably as room-access discs for intimacy inns.