Hi Sara, I'll give you some advice here. First thanks for giving me some thoughts on the rings. The small one with the 2 dark stones with the blue looking stone in the middle are garnets I think. The stone in the middle is an opal. That ring was found in a hole with a rusted musket ball reading a plus 2 breaking up and hitting the negatives. The band is so thin you have to be pretty skilled with your machine to find them. Always recheck your holes. I found it on my birth day to boot. Every year on my birthday for some reason I find a great find. The first year with my dfx on my birth day I found a 1908 D barber half in V.F condition. I'm just lucky I guess.
Have you ever detected before in your life. Or are you just getting started and looking around. Depends on your budget. For me to give you an accurate opinion of what I think. If you can afford a high performance detector I would get one. If your just trying to find your first detector I would by an mxt for the money slightly used on ebay for about 550.00 to 600.00. My brother who is 15 has one. I tested it and it's a damn good detector for the money. It goes deep to. The first day I used his mxt I found a 1961 franklin half at 8 inches. Picked it up and locked on it with no problem. It goes about as deep as the dfx in my opinion. But isn't as good as the dfx in my opinion. The reason why it isn't is because the dfx is so programable that you can constantly re adj it's settings to pick up more.
Hope this helps some. Tell me a little more about what your intrested in and maybe I could help you a little better.
Good Luck Jer