Tara creates a ring/braclet for herself, Spike & Buffy to let them know when Willow does magic

Buffy & Spike are together & Willow's doing her magic stuff. Tara realizes how off she is and knows she'll try something against Buffy & Spike. She makes a protection for each of them to wear (can't remember if it's a ring or braclet) but it prevents Willow's spell from affecting them and also lets them know a spell has been cast.

Thanks for any help. I've been wanting to reread this one, but my mind is drawing a blank.

Awakenings by dreamweaver here at SR

Yes! That's it. Thanks so much. It was driving me crazy.