2 Unique Accessories, 1 with Infusion
The process of infusing a trinket is not the same as slotting an infusion. (Yes, I know, it’s absolutely needlessly confusing)
Judging from the wiki, however, it seems accessories can’t be infused. https://wiki.guildwars2.com/wiki/Infused_equipment
Oh, okay. Thank you. Guess it goes in the bank. I think everyone has this earring already.
Rings are the only trinket that can have more infusion slots added (technically backpieces too, but you can only wear 1 at a time), so the infusion trick only works with those.