So...
Explosive Gem (Ps): Once(?) per day, a beljuril dragon can spit a green, violet, or blue crystalline lozenge up to 75 feet away with pinpoint accuracy. This lozenge converts fire, light, or sonic energy into electricity (in a manner similar to energy conversion, except that it is manifested as if it was a x-level power). It disintegrates on impact, but 10% of the time it breaks apart into 1d6 fist-sized beljuril gems worth 5,000 gp base value. (Beljuril gems are described in Magic of Faerûn.)