slag
gold
Gold is a precious metal.
iron Tole
Yes, the noun 'gold' is a common noun, a general word for an element, a precious metal, a color resembling the precious metal.
The word is jewel. It is defined as a precious stone.
rock
diamond
Precious ,
Agate
A four letter word starting with the letter a is able.
Zarf is a four letter word. It means a metal cup that holds a hot coffee cup.