which Platinum alloy?

[whitephoenix]

Hi,

My boyfriend and I are buying a Platinum engagement ring. The jeweller is telling us that the platinum he sells is Pt950 with Cobalt or Pt975 with Ruthenium.

I wanted a Platinum 950 with Ruthenium because of it well known hardness, resistant to dents /digs and white colour. Also I’ve read Ru is resistant to oxidation unlike Pt-Co which turns blue after a while.
So my question for the experts is are the alloys above any good compared to this alloy? Is it worth spending so much on?

 

[strmrdr]

Pt950 with Cobalt sux, don''t get it.
Pt975 with Ruthenium, not sure how this would compare to 950RU.

 

[whitephoenix]

Thanks for the response, I''m not a big fan of cobalt either. But I don''t know if 975Pt-Ru is as good as 950 Pt-Ru?!!

Does anyone have some hard core fact/experience about these 2 types of Ru alloys? I need some expert advise as I need to make a decision in the next 2 days