Hello!
Writer of the Ahri bio + short stories here.
Could you be thinking of the twin gemstones that Ahri received from her parents? If so, I wrote that with her current splash art in mind. Ahri has a bead hanging from her waist -- since the stones are carved to fit together to create a sphere, I imagined she tied them to her waist to keep them with her always.
Her short story, A Fair Trade, has a few more hints as to where the stones may have originated from as well as a drawing of the stones. Feel free to check it out!
Ahri wrapped her cloak around her nine tails and fiddled with her twin sunstone tokens to distract herself from the stench, rolling them between her fingers and snapping them together. Each one had the shape of a blazing flame, but they were carved in such a way that their sharper edges fit together, forming a perfectly smooth orb. She had carried the golden stones since before she could remember, though she had no knowledge of their origin.
Links:
Ahri Bio
Garden of Forgetting
A Fair Trade
Thanks for reading :)