A dear friend recently approached me and asked regarding why the shia sect recites the shortened darood in the namaz and in general, and not the full ibrahim darood.

I've never really thought about this before, so approached you here.

Also a mini question:

what stones( for the ring) are recommended and which specific did the imams and the prophet(saw) wear? Also give details regarding which hand and fingers are more recommended to wear the rings on.

All the sects recite durood on Muhammad and Aale Muhammad in namaz as ordered by the Hadith of the Prophet.

Aqeeq is the most recommended stone.

Other valuable stones recommended are ruby, emerald, firoza etc.