All the gold that will be worked into jewelry must be alloyed (mixed) with other metals in order to obtain sufficient strength. Gold is available in several different karat levels indicates how much gold as gold alloy contains.
Gold can become discolored and it depends on the chemical and mechanical phenomena, including as it is affected by sulfides and chlorides in hudavsöndringar, sweat, saliva, etc. It is the proportion of copper and how your body affects the copper that makes the jewelry may be discolored.
This ring is not made by our own goldsmith, it is made by Wildcat in Germany.