How does the weight of the bracelet feel? I have found 14K that has been tarnished in my areas. Good luck and update once you know. I have yet to ever hunt at night.
I had found an 18k chain that was stained from some nearby metals. I thought it may have been fake because of that. It was real and cleaned up nicely.
Give it a cleaning, it should be good to go.
I don't have a test kit but I figured out a way to test my items two ways. One way is to throw questionable finds in the tumbler for a few hours. If its plated you will find out when it is done. If not you will just need to polish it up. Also I recently dipped a questionable ring in tarnex, it quickly changed color identifying itself as junk.
The other is a 925 ring with cz or glass. It has been on the beach so long that the silver is pitted and it's misshapen. The opal is pitted a little too. I think it's real.
I was Jooped again with the "gold" None of it was real. The bracelet was marked 14k but acid test eats right through the sample. One of the clasps is magnetic too.
I recommend acid testing directly on the bracelet, take a small file and scuff it and then apply a tiny drop of acid right on that spot. If you see green then ya, it's junk, if not it might be 10k which looks alot like that... That's how i test all of mine...