These jewels have a good resistance to the oxidation of water, on the other hand the oxidation in the air is faster, they can darken if they are not worn.pas.
Maintenance: expose them to light in an airtight bag that avoids contact with air and avoid putting them in contact with sweat, perfume, chlorine, humid air,
Jewelry can turn green and black on contact with the skin if you have a natural acidic reaction.).
Solution: Clean them with water and bircarbonate of soda..