There are three teleports in the level. Let's call the highest one 'A',
middle one 'B' and the one in lower left corner 'C'.

1)
You start with situation on the picture 1. Follow the green line and push
boulder marked by the yellow X left.

2)
Get three marked boulders to the teleport 'B'.

3)
Push lowest 8-ball right nad go to the marked position.

4)
Take the gem under you, push 8-ball left and run quickly along the green
line. Push marked boulder to the teleport 'A'.

5)
Follow the green and push lower marked boulder left. Then push the other
marked boulder to the initial position of the firts one.

6)
Finish moving of the marked boulder to the teleport 'C'. Then release
the column of the three gems by digging the marked ground.

7)
Move quickly along the green line. You have to prevent the falling gem to
fall right of the boulder. Get all of them left.

8)
Get all five 8-balls to the teleport 'B'.

9)
Now you have kind of 'bridge' made of 8-balls. You can get the acid tank
to the metal plate. Collect all gems on the left side of the level and
push the acid.

10)
Get the marked gem so the 8-ball falls left.

11)
Get the other two gems. Way to the plate is free.

12)
Melt the metal plate with acid and take rest of gems.