The Shin-Ra Beta from the Shin-Ra troops on the Cargo Ship

The Shin-Ra Alpha from the submarine crew and 1st Class SOLDIERS

Warriors Bangle from Eagle Gun (the Coral Big Materia quest)

I've Heard Ultima WEAPON has a Curse Ring during the first battle at Mideel before Cloud and Tifa fall into the Lifestream

Gold Armlet from the Dragons on Mt. Nibel

Most of the others worth mentioning have been already, definetly steal from the Turks in the Second Disc.