Time out!
It was the...
Square treasure box! Yeah I know, the name is so original that if you don't know it you can't find it.
Actually if you type "square box" in google you can find its image easily.
TheLuckyDragon had a very good feeling with the greyish-green being jade, and typing only "25.4cm 20.4cm jade" in google led to the answer.
Next object, I tried to make it easier. If you understand what kind of thing it is the answer is at hand:
Shape: Complex, main part roughly egg-shaped
Size: Usually about 0.5in long
Weight: Light.
Color: Orange/red and dark blue/dark brown
Defining characteristic: This small dragon is the friend of creationists
Edit: removed "best" in description to avoid confusion with something else, sorry.