everything is ranked as
iron- ordinary items without anything special
copper - items that have the ability to destroy a city
silver - items that have the ability to destroy a continent.
gold - items that have the ability to destroy a moon
diamond - items have the ability to destroy a planet
platinum - items that have the ability to destroy a planetary star
stars (1-5) - items that have the ability to destroy a galaxy/ galaxies
infinity (1-5) - items that have the ability to destroy a universe/ universes
there are also growth type items