Help! i have got the silver dragon eggs, and i have almost killed the hole drow city! but suddenly when i was about to go back to the dragon, i discovered my light gem was gone!!! maybe i have dropped it somewhere ore maybe this is suppose to happen?! any help would be great!...

If u are in single player you may be out of luck. In multi, you can just import and export from previous saves to get it. Otherwise you're going to have to backtrack.

Its not that simple like i just load a quick load or auto save.... cause i aint got one!! the last load is where i did the quest in trademeet (LONG time ago!). and the auto and quick save´s are after i have made the HUGE mistake... i found out i gave the F-guy´s fake eggs and replaced them with the real ones, that i gave to Phaere! Stupid! Then when the mother startet praying, i killed her (and took the real eggs),and Phaere! now that i have the real eggs, and destroyed the hole drow city, i suddenly cant find my light gem! shall i start looking?? or what??

Why don't you just cheat the light gem back? The item code is MISC9R.

But how do you cheat???

This has been taken from the faq by DSimpson on gamefaqs, so don't sue me okay
Step One: Open the game's directory C:\Program Files\Black Isle\BGII - SoA

Step Two: Open the Baldur.ini file in notepad.

Step Three: Find the line [Program Options]. Under it are a variety of
settings for your game. Add this line:

Debug Mode=1

And it must be Debug Mode=1, not debug mode=1 or anything else.
Save and close notepad.

Step Four: Now when you are in the game, press CTRL-SPACE to bring up the
Console. This is where you will enter all the cheats.

Then type: CLUAConsole:CreateItem(MISC9R)

ok, it seems like it works, but how do you type the : ??? When i am doing that the < just pups up!

It says file not found! Help!