It has been suggested that this page be Merged with Skill Runes. (Discuss)

As part of character class customization in Diablo III, Runestones (Runes) will return from Diablo II. The runestones will be used to enhance character class skills. The runestones will be classified into 5 types, namely Crimson, Indigo, Obsidian, Golden and Alabaster. Each type of runestone gives a different effect and attribute to the base skill. It also has different levels, and the higher the level of the runestone, the greater are the effects and attributes given to the skill. The use of runestones will increase the number of skill variations to 6 including the base skill. And as each character class has at least 20 skills, the overall total of skill variations per class is 120.

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