e/Hierarchy of precious substances

Information
has gloss	eng: 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 be introduced as part of the system. The sequences can provide interesting examples of the arbitrariness of semiotic signs.
lexicalization	eng: Hierarchy of precious substances
instance of	(noun) any of the less common and valuable metals often used to make coins or jewelry precious metal