What is this Black stain on my Return to Tiffany Ring?

[Sakura_Hanami]

I’ve had this ring over a year now and it has been cleaned at Tiffanys twice and the this weird black stain seems to reappear very quickly. It does temporarily go away when I buff it out but comes back within hours. Is this normal? It doesn’t seem to go away

 

[lill_canele]

If it's silver then it's most likely oxidization.

Generally oxidization does not appear that quickly but I have heard that metal reacts differently to each person's skin depending on the chemical composition of each individual.

Also, (you probably already know this) but its best for silver to not touch water, makes it oxidize easier and faster.

Hope that helps!