Here is a link look at the post dated Jun 5th 2002.
http://everquest.allakhazam.com/db/item.html?item=1239
So the focus effect on the chrysoberyl talisman went in a short time before this date I would assume.
August 2002 on this one metions Azure sleeves have focus effect.
http://everquest.allakhazam.com/db/item.html?item=2263
It was probably middle Luclin when focus effects were released. I would guess in April or May 2002. Sorry Ecoli...