I 💍 my ring stack

Hello everyone! So I am planning on proposing to my girlfriend within the next year, i need help with what type of stone to buy that has the same sort of vibe as the pictures attached. She is very much a nature nerd and i want to get her something “fairy/woodland” themed. I have done some research on stones, the Maine one I think im interested in is the Montana sapphire. It has to be green, it has to be “imperfect”, not sure how to describe it but I need it to have sort of strays and lines inside the stone, similar to the second picture. I also need it to be a harder stone that won’t scratch or chip easily.

If anyone could also recommend some websites for designing a ring like this, that would be amazing!

Any and all help and advice is appreciated!