I am on the journey of learning everything there is to know about diamonds and engagement rings! I plan to propose to my GF on NYE this year 
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We have had some initial hints/talks about basic criteria of the ring. She pointed out that she likes plain solitaire setting e.g. the Tiffany setting/style.
-> She is very petite, size 3.5-4 finger. Small length fingers too.
-> Nurse (& plans to wear every day - not sure if this will change - if the ring gets in the way she may want to take it off, leave it at home and wear a plain band- not sure...)
-> Her friend-circle seem to get less than 1.5 ct rings, but with high specs (e.g. D, flawless, etc)
-> Right now I plan for 1.75-2 ct single large stone, but lower specs to her friends (e.g. something like VS2, I, Ideal, Round, ~US$14k)
Questions:
1. If I go this larger size, is it going to look like a monster on her finger (e.g. too big/too prominent, protrude too much and cause her issues if she wears it day-to-day as a nurse)?
1b. Is +0.3ish carat even that much 'larger' anyway - or would it be unnoticeable to the standard eye from a 1m distance.
2. Is there such a thing as a low profile solitaire setting?
3. Will these lower specs detract away from her ring/stone compared to her friends (they won't be holding them up side by side I imagine and no body carries around a microscope with them!).
4. Should I be looking at a stone other than Round, or a band other than Solitaire?
5. Should I go a 6 prong so the stone is more secure?
6. Am I on the wrong track with anything so far in my thoughts/journey?

We have had some initial hints/talks about basic criteria of the ring. She pointed out that she likes plain solitaire setting e.g. the Tiffany setting/style.
-> She is very petite, size 3.5-4 finger. Small length fingers too.
-> Nurse (& plans to wear every day - not sure if this will change - if the ring gets in the way she may want to take it off, leave it at home and wear a plain band- not sure...)
-> Her friend-circle seem to get less than 1.5 ct rings, but with high specs (e.g. D, flawless, etc)
-> Right now I plan for 1.75-2 ct single large stone, but lower specs to her friends (e.g. something like VS2, I, Ideal, Round, ~US$14k)
Questions:
1. If I go this larger size, is it going to look like a monster on her finger (e.g. too big/too prominent, protrude too much and cause her issues if she wears it day-to-day as a nurse)?
1b. Is +0.3ish carat even that much 'larger' anyway - or would it be unnoticeable to the standard eye from a 1m distance.
2. Is there such a thing as a low profile solitaire setting?
3. Will these lower specs detract away from her ring/stone compared to her friends (they won't be holding them up side by side I imagine and no body carries around a microscope with them!).
4. Should I be looking at a stone other than Round, or a band other than Solitaire?
5. Should I go a 6 prong so the stone is more secure?
6. Am I on the wrong track with anything so far in my thoughts/journey?