Copper, silver, or gold MC cartridge coils?

@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.....

I wonder why nobody plays around with the wiring of MM or MI cartridges. Higher voltage maybe wire has less effect?

They do actually, LC-OFC versus PC-OCC.
Grace and Audio-Technica made different versions.   

Dear @edgewear : Yes you are rigth because Lyra asked for the Parnassus sample to build the Olympos and yes too with the Koetsu that does not needs a donor cartridge.

Yes, different application sonic benefits.

R.

Dear @mijostyn : I think that the more expensive high output ( MM/MI ) cartridges are the ones coming from SoundSmith and PL never says he is using silver or gold wire in the coils but cooper.

No singler vintage HO MM/MI use silver wire in its coils. The rule is cooper as with LOMC ones too .

Some LOMC , maybe by marketing issue, use silver or gold wire but this is not " normal " and perhaps only a marketing hype to ask higher prices for it. Only the manufacturers can tell us the true behind their choosed coils wire types.
R.

I have a Koetsu Jade Platinum cartridge which sounds amazing.  I understand it is the wiring and not the magnet that is platinum.   It is utterly natural-sounding, clear and seductive - can transport you into places no other source has achieved for me.