be careful with the white gold, most of it is plated with rhodium (a metal in the platinum family); white gold itself is dull, and this is done to make it shiny. I had a jeweller in the family, and got my original wedding band from him, many years ago. When he asked if I wanted it plated, I said no. I’m sure my face was a treat when I first saw it; it was immediately plated! This method of cleaning might remove the plating eventually. I’d check with a jeweller before doing it too often.
If the jewelry is very dirty or very tarnished – like silver or gold – then you may need to repeat the process so just add a little more baking soda and more boiling water – but make sure it’s boiling, that’s key! You can also use a toothbrush to get in all the nooks and crannies of detailed jewelry. Be careful with precious gems, stones and metals.