Wow. That looks like Gold to me. Did you take some home to check ????

I have some chemicals I use to check for gold. You can get them on Amazon.

https://www.amazon.com/Silver-Tester-Sterling-Testing-Precious/dp/B09D7JLG8L/ref=sr_1_6

Metal Detectors: https://www.amazon.com/Garrett-1140900-Pro-Pointer-Waterproof-Pinpointing/dp/B00TADH9HA