The action "Trigger Event" is going to be what you need for this one.
https://hutonggames.fogbugz.com/default.asp?W37Your going to want to create a box collider on your elevator, around the area where the car is going to drive into it. Make sure you check the box labelled "is trigger" on it.
Create a new tag for your diamond prefab and call it "Diamond" for example
You could give you player character a tag instead if you want too.
On your elevator prefab you will have a initial state that will sit there and wait for a diamond to enter that colider area.
So state 1 would simply have the trigger event action.
and one transition event that you could call "goToElevatorUp" or something.
Use the following settings on the trigger event
Trigger: OnTriggerEnter
Collide Tag: Diamond (or the player's tag if you want the car to trigger the next event)
Send Event: goToElevatorUp
In state 2 next to state 1 on your elevator you can use a "wait" action, and give it a value of 5 (for 5 seconds)
then add a "finished" event transition by right clicking and choose add transition, then right clicking the ... grey box and choosing "FINISHED" (so after the 5 second wait it will go to the next state.
State 3 will have the "translate" action, and you would put a value into the Y axis (and check the box labeled "per second")
This will make the elevator rise # units vertically per second.
You could also use a "itween move to" instead of translate if you want to use the nice sexy ease in and ease out movement to the elevator as well.
If that's the case, make an empty game object to use for the itween "transform position" value so that it knows where to go (up off the top of the screen or wherever). Place it directly above your elevator at the top of the "shaft" or something.
In the "Finish Event" section of the itween move to action, you can have it trigger off some other state (like adding to the players score) or moving the elevator back down etc. Just add a event transition (eg: goBackDown)to the same state as the itween move to action , and then populate it in that field that says "Finish Event"
Hope that helps!
ps. you could also animated the elevator in a different 3d package and use the play animation action to start / stop animations of the elevator as well.
for more info on triggers, check out this screencast tutorial
http://www.screencast.com/users/HutongGames/folders/PlayMaker/media/781369f4-7582-469e-8673-95af83761b0e