I've been hunting for this item for quite some time...
I've read on this board (and others) that it can be found:
1. at the monastery
2. in arnika temple
3. bought from arnika healer (i'm assuming this is lord braffit)

i cleared out the first 2 locations a long time ago, but don't recall ever seeing any lockets. i've saved n reloaded many many times at the arnika healer and he hasn't spawned any lockets. my party avg lvl is 20, if that helps.

any idea how to get one? tia.

I just got one... and I am way out in the Wilderness (wish I could remember the name), but it's the one with the Stonehedge Runes...

One of the Rapax Priestesses dropped one for me.

lockets of reflections are a random spawn. Throughout the game managed to collect 8 of them so just keep trying.

i got it in the monastry with the wheel lock