Parallel

A parallel uses the same design as the base card but in a different color, foil, or numbered version. An insert uses an entirely different design and is added on top of the base set (e.g., 'Diamond Kings,' 'Color Blast,' 'Negative Refractor'). Parallels mirror the base; inserts are standalone subsets.

Parallels are typically printed at smaller runs than the base card — sometimes serial-numbered to /99, /25, /10, or even 1/1. Scarcity multiplies value, especially when paired with high-demand rookie or autograph cards.

A rainbow is the complete set of all parallel variants for a single player and card design within a release. Building a Patrick Mahomes Prizm rainbow means owning the base, Silver, Red, Blue, Gold, Black, and every other Prizm parallel of that specific card.