Super easy for metallurgy – you can easly smith it without heat at all.
Shiny as sun – got religious meaning all around the glob as Sun is super important. In cultures with low developed astrology sun also was connected to main deity ( with higher astrology development main deity went to Jupiter )
Does not disolves in most of acids. Main development of chemestry (alchemy) started from puting everythin into acids ( a lot if reasons why). Thus it became noble metal and had been connected to long life)
It is quite rare
Taking above together it becames a precious trading comodity. Platinum was more rare but did not have religios connections and was considered as trash for a long time.
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