User blog comment:Endless Exceptions/Custom New Item Ideas: Necklaces./@comment-3974211-20121010154314

I think it's unnecessary to add additional basic items like the Emerald, Amethyst and Topaz Crystal... you should just use, and ?

I also think Amethyst should have a fixed amount of damage. Otherwise, Karthus will just go Q, Q, Q, Q, Q, +15% on his R. I suggested the Amethyst Crystal once as a basic spell vamp item, like Vamp Scepter. Amethyst Crystal + Amplifying Tome for Hextech Revolver, then it can be combined with other items for AD casters. :)