I just found this thread. I might offer my experiences. My first solid gold interconnect was the Stealth PGS. I grew tire of the softness of gold and ultimately jumped to the Indras. What struck me with them other than that they did not sound at all like gold, is how encompassing they were. At various times during this period I tried palladium interconnects and just hated them. It might be that palladium like gold will not oxidize but they have a "sound" that I just find anathema to music. Next I tried non-metal interconnects from Cerious Technology and really did like the lack of "metal splash" with them. Then I heard of Jades.
I visit JD in his home an auditioned the Golds versus the Vermeil. I think the Vermeils are really gold plated. I was glad that I did because again I heard the gold and much preferred the Vermeils. Shortly thereafter the Hybrids were made with a "blend" of gold and silver. I bought only one pair of them and did prefer them between the dac and my line stage. I retained Vermeils elsewhere and later bought the Jade speaker wires.
I had heard demonstrations of the SRs stuff at CES and was impressed but never bought into the line. Then came the '08 RMAF and a very convincing demonstration of the new Tesla line as well as the ARTs for room resonance. I bought the ARTs at the show. On reflection of what I heard, I tried their PowerCell, then more pcs, and ultimately I reviewed a fully charged system, including pcs, ics, and speaker wires. These were mainly Apexs, Hologram A & Ds, and the PowerCell 10SE.
I must say that I have had a immense improvement in my sound with these and really think the "quantum tunneling" is a major contribution to their sound. I actually had Home Depot cheaters zapped and compared them to those just from the store. You would not believe what benefit there was from being zapped.
I don't hear any coloration in the SR line, and really don't know what metal is used, but I would guess silver. I will never go back to uncharged ics or speaker cables.
I have heard much more expensive ics, costing many times what the Apex cables do, and much prefer the Apexs.
Given my experiences, I will never try gold ics again.
As always, YMMV.