This ring is a vintage Black Hills Gold Ring. It say's 925 and 12K on the inside band. I didn't know how something could be sterling silver (the 925) and gold (the 12K) so I researched it and found out that it's 92.5% silver and 12K Black Hill's Gold. There are only a few places in the country that manufacturer this style of ring that has a leaves theme to it. This one has the initials of RGC which means it was created by "Gold Diggers" in Rapid City SD.
I looked at other rings like this one and I'm thinking no two are the same as I couldn't find any just like this one. I would think this would make them highly collectible.
This ring is tiny. It would fit most people's pinky finger. My ring sizer says it will fit a 4.5 finger. The band is not perfectly rounded, but it looks really nice. The leaves are two copper color leaves and a gold colored one. Not sure these color difference show up in the pictures very well. This makes it stand out more in my opinion.
*I am not an authority on jewelry or rings. I'm trying to learn. I make my best guesses as to what they might be and offer pictures so you can determine for yourself what they really are.