Gems

There are 6 varieties of gems that can be collected as drops from enemies: Ruby, Diamond, Amethyst, Emerald, Aquamarine, and Rose Quartz.

Each variety of gem gives a small boost to one of the 6 player Stats: This boost is a 1:1 ratio, for every gem collected of that variety the corresponding stat gets +1.
 * Ruby - Attack
 * Diamond - Defense
 * Amethyst - Intelligence
 * Emerald - Mentality
 * Aquamarine - Speed
 * Rose Quartz - Luck