Cognate rings are accessories that Cognates wear on each of their thumbs when performing mind readings. Fitz gave Sophie a pair as a Midterms gift, which were engraved with their initials, SEF and FAV. When Cognates' minds are telepathically linked, the rings snap together, since the rings are made of a specific mineral used for Cognate Rings.

This could be proof of Fitz's crush on Sophie.

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