Your jewelry is made of 925 sterling silver and gold plated sterling silver. All pieces have a surface treatment against tarnishing.
These surface treatments will fade over time because of contact with clothes, hard surfaces, sweat, perfume, hairspray, air pollution and others.
The 24 carat gold and rosé gold plating can gradually wear off with steady use, giving the appearance that it has faded.
Everyday or very frequent wear, may speed up this process, especially on items like rings and bracelets, which have more frequent contact with surfaces.

If you need to squeeze your jewelry to fit your size, please do it gently to avoid breaking.

Avoid direct contact with water and chemical products e.g. soap, perfume, abrasive products, as they all can cause tarnishing and damage.

Remove jewelry when doing household tasks to avoid impact with hard surfaces as much as possible.
Gently wipe jewelry clean with a soft cotton cloth after each wear to remove make up and skin oils.