Weapons:
Bronze:basically less than average weapons and don't have any abilities
Silver:these are just basic weapons and usually have only one ability and are durable to an extent.
Gold:harder to craft weapons but even harder to find these usually have two abilities and come with an armor set to boost those abilities.
Diamond:secondary peak of weaponry they usually have devastating AOE skills and devastating single damage skills and come with an armor set to not only increase the damage but also passively debuff foes.
God shatter:these weapons and armor sets or the most difficult to find and nearly impossible to craft these weapons and armor sets carry either devastating debuff effects or world ending attack skill the only way to penetrate God shatter armor or weapons is with another God shatter weapon.