Soul Gems

are an Equipment series introduced in Yo-kai Watch 2.

Soul Gems are the transformed state of Yo-kai Medals, resembling wisps that are colored in the same hue as their respective tribe's color and marked with their tribe's emblem.

The Soul Gem conversion process is performed by the Grand Monk at the Temple of Virtue with the use of Soulcery, but the process of Soul Gem creation will result in the loss of that Medal.

Usage
When held, Soul Gems will perform various purposes, depending on the Yo-kai Medal the Soul Gem came from they can raise specific or all stats of either the holder or adjacent allies, reflect damage, restore the Soul Meter/HP Bar of either adjacent allies or the holder, increase the rate of critical attacks, increase elemental damage/resistance, recover HP while inspirited, etc.

Soul Gems can be increased in strength by fusing with other Soul Gems, though they are divided by 4 static power categories of increasing potency:, , , and.

To strengthen them there will be a base and a material. The base is the Soul Gem you want to strengthen while the material is the one you want to strengthen the base with. You will lose the material after the fusion.
 * Not only do Certain Soul Gems do not have a level, certain Soul Gems transform into an altogether different form of fusion with each other, and do not look like typical Soul Gems. These Rare Soul Gems' abilities usually have an effect that is tied to the fused Soul Gems' theme.

Trivia

 * Certain Soul Gems emulate certain Skills, such as:
 * Soul Gems who heal allies after the holder faints work in the same manner as the Skill Blessed Body.
 * In Yo-kai Watch 2, certain Yo-kai could not have their Medals converted into Soul Gems. All of these Yo-kai are those who have been introduced as playable Yo-kai in Yo-kai Watch 2: Shin'uchi (Snottle, Moximous N & K, Jibanyan S, Komasan S, Komajiro S, Darkyubi, Illuminoct, Gargaros, Ogralus, and Orcanos).