We use nickel-free metals and our earring posts are either in 16k gold plating, 925 sterling silver, stainless steel and titanium.
All gold plating and rose gold plating materials used in our designs went through secondary coating. They are stronger against humidity.
For a lasting colour, after taking off your jewelry, clean it with a dry soft cloth. Use polishing cloth only when plated materials lose shine. Put it into an airtight container or bag.