Copper, silver, or gold MC cartridge coils?

The closest I got to comparing coil materials in a more or less level playing field was hearing three different vdHul Colibri’s in the same arm (Reed 3P 12" Cocobolo) in immediate succession: XCP (copper coils, plastic body) XGW (gold coils, wood body) and XPW (platinum coils, wood body). As far as I know there never was a Colibri with silver coils.

In my system I had a clear preference for the platinum coil version (a limited series and no longer made). It struck a nice balance between the fast, dynamic, punchy sound of the copper version and the smoother, more refined presentation of the gold coils, while adding a superior 3D stage neither of the others could match.

Disclaimer: the Colibri as a breed are known to be temperamental and the word goes they all sound different. So a similar comparison with three different samples might yield a different outcome!

BTW: this comparison was done prior to the introduction of the current Stradivarius and Signature versions. These new systems may have very different characteristics and be more consistent than the previous series.

@rauliruegas  vdHul used platinum wire for the coils in a short lived series of the Colibri (discontinued as consistent high quality platinum wire apparently was no longer available).
 
As for Koetsu and Lyra, I always understood that they use(d) platinum for the magnets. Apparently these are also rare, as Lyra needs a donor cartridge with such magnet to build a new one. Then again, Koetsu seems to have no trouble sourcing platinum magnets for their gemstone models. In any case, this is quite a different application of the material, likely to yield different sonic benefits.

I may be wrong, but as far as I know there's never been a cartridge that used platinum for both the coils AND the magnets. Would be an interesting beast.....