Hierarchy of precious substances
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In popular culture, sets of precious substances may form hierarchies which express conventional perceived relative value or merit. Precious metals appear prominently in such hierarchies, but as they grow, gems and semi-precious materials may become part of the systems. The sequences can provide interesting examples of the arbitrariness of semiotic signs.
[edit] Traditional manifestations
Jubilees have a hierarchy of years: silver (25), golden (50) followed by diamond (60) and platinum (70).
Wedding anniversaries extend the jubilee hierarchy with various sequences of substances filling in many of the gaps between the major milestones: silver (25 years) - pearl (30) - ruby (40) - gold (50) - diamond (60) - platinum (70).
Ancient Greek mythico-cultural cosmology depicted a decline from a golden age to a silver age followed by an iron age.
[edit] Modern adaptations
The measurement of sales of popular music starts high relative to the wedding anniversary scale, concentrating on gold and platinum. See gold album. Likewise, credit card companies usually have a "gold card" and a "platinum card"; some have introduced a "titanium card" as a grade even higher than platinum.
Sports events have a well-established convention (introduced into the Olympic tradition at the 1904 Summer Olympics) of a hierarchy of medals: bronze medal - silver medal - gold medal. This presumably echoes conventional coinage systems, in which cheap bronze or copper denominations could aggregate to intermediate silver coins, then to gold money. The archetypal British designations: penny, shilling and pound parallel and reflect this hierarchy.
Events-sponsorship in sport or in the arts may involve (for example) silver, gold and/or platinum sponsors.
