just wondering why 583 or 585 gold is a standard fineness in many
places but 585 platinum doesn't have a high profile.
Bill, 583/585 gold is 14K. There is a many centuries old tradition
of stating the fineness of gold alloys in karats. 583 or 585 (one is
exact, the other gives a slight over karatage to allow for error,
etc.) are simply the decimal markings for that traditional karat. 585
platinum has no such traditional history.
Platinum's fineness isn't normally stated in Karats, and
traditionally has been used as a pure metal, or alloyed down just
enough to give it suitable durability.
Alloying it down more, to 585, does nothing to improve the alloy, it
only lowers the cost. Without the traditions behind it, it soulds
oddly strange, both to consumers and many jewelers, simply cheapening
a metal that traditionally is viewed as a premium jewelry metal.
Cheapening it simply makes it less desireable, as I see it, not more.
If you want cheaper than platinum, don't mess up the platinum. Go
instead for a high quality 18K white gold.
thats my 2 cents on it...