Logos is one of the three pillars of rhetoric, along with pathos and ethos. in that context, it represents reason and logic.
Logos also has a lot of religious significance — Christianity refers to Jesus as an incarnation of logos, which Gnosticism seems to have some feelings about as well.
I haven’t really sorted through all of this yet, but I do think that it would be a mistake to assume that logos here is only related to logic, without considering any sort of attachment to the “divine.” Especially considering none of the artifact descriptions have very clear ties to “reason” or “logic.” And also especially considering the actual piece: a circlet, a tiara, a crown, etc. — they must be symbolizing something else.