1 × Topaz (Pear) - The port. Underwater next to the boat.
Chapter 4-1
1 × Topaz (Pear) - Caves. Inside the torch next to the exit.
1 × Topaz (Pear) - Ancient village. In a brazier between two sets of steps at the point Chris and Sheva are separated from one another after the bridge collapses.
Chapter 4-2
1 × Topaz (Pear) - Worship area. Embedded on the wall above your starting position.