Re: An ideal metal for energy work?
I personally prefer steel and "human-modified" metals (includes bronze, brass, amalgams and galvanized/plated stuff, etc.) over "natural" metals with a low level of dilution (gold, cast iron, non-currency copper, silver, nickel, aluminium).
The way I see it, steel is more-or-less the ideal example of a metal that is easily obtainable, malleable, strong, and capable of being subjected to an array of conditions before it loses structural integrity and quality.
I consider white gold to be "human-modified" more than yellow gold, since it's rhodium-plated and not pure gold. My engagement ring is lab-created emerald in white gold; my pocket knife is steel. Those are two things that never leave contact with my person, so I regard them as holding a charge for me better than other objects, as much out of familiarity as materials.