What should I with the gems?

Hint 1 of 3:

There's really no way to solve this puzzle except through trial and error.
Or if there is a way, I couldn't find it.  The answer will be given in the
next question.

Hint 2 of 3:

Put three green gems into the three holes on the console.  The Light of
Knowledge will talk to you.

Hint 3 of 3:

Then all you have to do is walk into the light.