Possible Clues:

• Middle Eastern gun on this bomb
• Size of big explosion turning up no precious stone
• It's not a stone to be lifted — it's a heavy weight
• Nuclear test unit
• Unit of power
• Atomic bomb unit
• Great force knocking over something evidently without sparkle?
• Measure of explosive power — montage (anag)
• Huge weight, as opposed to a stone, raised
• Description exposing fake jewel put up for quite a few pounds