316l stainless steel is being used to make jewels and they have started to plate them with rhodium ,316l fades away after a short time on 22k acid ,running a double check test on the 22k acid test,take a clear white tissue to swipe your rock and take a look at the colour on it,it will be kind of greenish or yelow realy like bright ,uncomon colour lollll basicly white gold is basicly yelow gold ,when you scratch it the mark is white but puttiung your 18k acid on it will turn automaticly yelow gold and even if you have a verry strong 18k piece and you test it 22k and it takes time to fade,your scratch mark even if white will turn first yelow gold and when its starts to fade will turn brown or kind of redish,alot of people are hesitating or are scared when it comes to white gold.... keep in minde white gold is yelow gold and the result on a scratch test are the same or pretty close.. stainless steel scratches white and even on acid test and resisting...stays white, other option and practice it test directly your piece,putting your acid directly on it,stainless steel you will have 000 reaction to it... white gold even if its real gold and no plating a strong acid will leave a burn mark to it