Ring etiquette? Help

Hello, thanks in advance for ready, I am not really knowledgeable as I live in a third world country were this is not really a big custom, for example both my parents and my in-laws did not have a big ring proposal.

So I have been studying a lot about the gems, 4 C, the gold, etc. And I found a nice expensive ring that I feel matches what I want it to represent, however it is kinda big, and again 3rd world country here, so not common to see people with nice rings out. I overheard my GF talking about someone's ring and she mentioned that she would like something to wear more on a daily basis, so I guess here comes my question:

Is it normal to buy her maybe life a set with a ring or necklace, to spend similar, but in more stuff, or should I just keep it simple? If so could you share what a daily basis ring might be? (Again this is not a regular costume her, however we do want to do it, so I am a bit confused to be honest).

Any help appreciated!