Actually, it's the opposite of what was commented earlier. Black Hills Gold is 10k, and it is the "colored stuff". As for what on there is the 12k, I don't know but assume the rest of it would be.
Congratulations! You did fine for $10 each for the Black Hills Gold watches, and that turquoise/sterling lot for $4 is a dream. Did you find all the gold at a single sale or multiple sales? Such a nice return for a few hours of your time. I would love to wear those rings. I wear the ones that I find to church, parties, dining out, or to special events. I just can't put them (or most of my gold earrings) on to just go to garage sales. I'm always afraid that I'm going to lose it. Good luck tomorrow.