Gold-filled jewelry has 10x more gold alloy than gold plated and because that layer is so much thicker, it means gold-filled jewelry lasts longer and stands up to wear and tear better than gold plated.

Gold plated jewelry is great quality at an affordable cost, Plating refers to the process in which a piece of jewelry (non-gold) undergoes a certain process that allows it to be covered in a layer of gold.
How to clean and care for your jewels
To clean your jewelry without scratching it (which would lead to tarnishing) use an untreated cloth or mild soapy water. Do not scrub the piece. As for gold-plated, clean only if you absolutely must. We suggest using a cotton ball and as with gold-filled do not scrub.
Due to the chemicals within the formulas of fragrances, lotions, and other products, they can cause jewelry to tarnish more quickly. To avoid this, simply apply any fragranced products a couple of minutes before jewelry, and wait until everything dries so it doesn't interact with your pieces. Also, your hygiene has a lot to do with tarnishing everyone’s PH levels are different and that’s another factor on why some Jewelry doesn’t last long for people.