Here's that question

I'd have to go with the weekend away. But do your homework. Make it at a place where you can enjoy other things -- walk on the beach, secluded picnic, visit to a beautiful park, etc. ..
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Make it special for both of you with small things -- a massage, lots of pillow talk and remembering the high points of your year together. ..
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You told us, now tell her. Let her know how happy you are in the relationship. But don't take it too far unless you're going to spend some of that extra loot on a ring...

I'd also go for the weekend getaway, or if not that, then the fancy dinner. I favor the shared experiences over material gifts. Actually the diamond earrings and tennis bracelet do nothing for me, but I'm not your gf. ..
BTW, what a sweet thought and question! Have fun, whatever you choose. She's a lucky lady...

I'm the yin to Carlos' yang .....
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Oh I love being in on surprises,..I wish you would have told us a bit more to go on, how old, some likes/dislikes, but here goes ... ..
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I'm kinda "themey" so maybe I'd work with the "Firsts" - bring her to the first place you met or fell in love ... stop and put her face into your hands ... and kiss her like it was the first time;..take her away for the weekend to a place where neither of you have ever been, a first for both of you; Start a tradition of buying her something that you can do every year, it doesn't have to be something expense if you still want to go with u're big gift, maybe a figurine, collectible, or a trinket. Whatever you buy her, give her a story to cherish along with it... ..
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My Carlos is a thinker & planner too and he's melted my hearts too many times to mentioned, all I can assure you of is,..whatever you do, all your efforts will move her in ways only the two of you could imagine. Angie..

This is tough to answer, because we don't know how serious you two are...If it's the one-year anniversary, then I'm assuming there must be some love there...In that case:..
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Don't do the fancy at home dinner, unless you can cook...If you can cook, then definitely do that...
Otherwise, take her to her favorite restaurant...I would skip the gift, because if she doesn't have much money, you don't want to make her uncomfortable by buying her an expensive gift...
If she's an outdoors person, plan a picnic...
Basically, I would cater to her and whatever she loves...You can't follow a textbook with this, because all women are different and she may love something another woman hates...