Several spellhearts, mostly from Secrets of Magic and Treasure Vault have lines like "After you cast a <spellschool> spell by Activating <the spellheart>". But they are mostly redundant and mean only "After you cast a spell by Activating <the spellheart>", because, rather logically, such spellhearts only have spells from these schools.
I found only Radiant Prism with (cantrip!) Light which wasn't Abjuration, but it's 16+ lvl and irrelevant to PFS anyway.
These are important items for spellcasters (and not only to them, constant properties seem to work even for PCs unable to cast spells from them).
I want my Grim Sandglass back... :`((((
