Show me your engagement ring!

So my FH apparently wanted to surprise me for the holidays. He started asking me questions yesterday and finally just caved and said he is too nervous about spending that kind of money on jewelry without my input since I don't wear jewelry (I am extremely allergic to nickel, it burns my skin, so I usually skip jewelry all together). I started helping him find/design a wedding band to which he said "shouldn't we start with the engagement ring and match the band to that". It never even crossed my mind that I would get an e-ring, so I was kind of in shock. He started asking questions about ring styles and carat size and I am now so lost and a little stressed. I want to pick something I love but all of these decisions are intimidating.... Solitaire, studded, 3 stone, Halo.... There are so many choices my head is spinning so I decided to ask you for some help. Can you show me your engagement ring and tell me a little about it? If you helped design or chose your ring, how did you decide on that particular one? How did you decide what carat size to pick, what setting to choose, and wether or not to add accent stones? I feel stupid not knowing about all of this stuff and I tend to be indecisive in general so this one is kinda tough for me. I don't want to make the wrong choice and regret it...