When you read the description on Taric's ult. . . .

Taric slams his hammer into the ground to deal damage to nearby enemies. For a time after, Taric's gems radiate energy, empowering Taric and his allies with bonus Attack Damage and Ability Power.

Taric's gems radiate energy. . . .

https://media.giphy.com/media/FoUHKTJhoQU6I/giphy.gif

https://media.giphy.com/media/HsekC0u9JfyEg/giphy.gif

(I just wanted to get that out of my systems before the rework changes it.)