I don't know about brilliant pebbles, but this is pure gold:
Was this before or after you developed the rock polisher?
I presented a paper to national conference fifty years ago regarding a design for a low thrust high specific impulse rocket engine for interplanetary space travel that develops thrust by bombarding metal polycrystal with a highly accelerated Xenon ion beam, producing sputtering of atoms from the surface of the metal polycrystal.
Was this before or after you developed the rock polisher?