Vintage Gold GIVENCHY Pendant on thick gold rope chain.

Vintage Gold Givenchy Pendant ( 4 G’s logo ) on 18 inch gold rope chain. I don’t know too much about the necklace I’m sssuming it’s not real gold as you can see in the pictures where some of the gold finish rubbed off and it’s got a silver undertone. I’m pretty sure it’s atleast 40-50 years old however it could be older. Not sure if it’s 24kt or 14kt gold plated possibly. It definitely has a patina from its age however I don’t want to clean because I’ve been told that could hurt the value. Had a 18 gold chain to match. I don’t believe the chain is real gold either however there is a possibility . I do not have a gold tester. From what I was able to gather by googling images of the necklace is that it’s made by Givenchy. A luxury brand founded in France by Hubert de Givenchy, a French fashion designer known for making clothing and jewelry since the 70s. If you happen to know more about the necklace I’d love some insight