How much is a gold necklace with 375 on it worth?

A gold necklace marked with "375" indicates that it is 9 karat gold, which contains 37.5% pure gold. The value of the necklace will depend on its weight and the current market price of gold, as well as any craftsmanship or design factors. To get an accurate value, you can weigh the necklace and check the current gold price per gram. Additionally, consider any sentimental or artistic value it may have.