Holy Ring

Holy Rings are golden rings of varying size worn by several Digimon; most notably Gatomon. These rings give the Digimon great power relating to their holiness. They can be anywhere on the Digimon's body, and they signify the Digimon is, in some ways, holy.

Digimon Adventure
Gatomon's Holy Ring, which she also calls her "Tail Ring", gives her power the level of a Champion; without it she is as weak as a Rookie level. She loses it sometime in between the first and second season trying to escape from a Unimon. Without even realizing, the loss of the ring enables her to Armor and DNA digivolve just like the others (also, Gennai stated that he used the ring's holy powers to make DNA digivolution possible.) The Holy Ring is returned by Gennai in the final episode.

Digimon World Data Squad
The player can recieve a Holy Ring from Salamon in Sneyato Forest after talking to it. The player thus fufills one of the requirements to Digivolve Lalamon into Salamon.

Digimon who wear Holy Rings
Tapirmon's ring is on its leg; MarineAngemon's its neck; Salamon's its neck; Goldramon's its arm; Liollmon's its neck; Kudamon's its neck; Apemon's its finger; Hououmon's its legs (it has two); Rapidmon's its legs (also has two); and Lucemon's all its limbs: it has four, Angewomon on her legs.