We've been out together two times now - nothing very binding yet but I hope (and I think she does, too) that something will come out of it eventually. She is turning 18 on december the 6th (yep, seriously) and it's kind of a big thing here - just like turning 21 in the USA. What should I get her? I know for a fact she's interested in psychology and buddhism (a little). I was thinking about either getting her a bottle of wine and a book or wine + a set of jewelery. What are your suggestions, fellow gentlemen? Thank you in advance.
Two dates seems pretty early for teenagers to give jewelry gifts.
Rather than buying her a bottle of wine ... why not take her out for a nice dinner, and order a bottle of wine while you're there (assuming its legal where you are)? I'd be more inclined to spend the money to take her out for a good time rather than on stuff. You're way early in this thing. Spend your money on doing stuff with her, not giving stuff to her.
If it goes well, believe me there will be plenty of time later to spend a bunch on gifts.
A fun night out, dinner, and if all goes well a nice kiss.
A big thing because she can now legally buy alcohol? I find gifts of bottles of alcohol to those newly of drinking age to be a cliched and wasted gesture. Unless the recipient has had exposure to lots of kinds of alcohol already, the chance the recipient will especially like your choice is slim, and then she's stuck with a whole bottle of it. [yeah, yeah, yeah; maybe she's been drinking whole bottles of wine for years now; but that's hardly the way to handle a gift or to begin adult drinking]
Jewelry's fine as long as it's fun jewelry - no gemstones or precious metals. For a new relationship, plastic, tin, ceramics (It's called "costume jewelry") are OK. If she knows about jewelry [Does she wear it regularly?], cultured or freshwater pearls are OK (because they cost about the same as plastic). The point is to have the gift match the seriousness (or lack thereof) and duration of the relationship in expense and substance.
Americans rarely give books anymore, so few here will be able to comment on that suggestion. The usual comment is if you get someone a book about her interest, how can you be sure she hasn't already read it? That it's neither too simple nor too technical for her? And, in the US it seems, That she's the kind of person who reads more than 140 characters at a time?
The out-to-dinner idea is fine, too. Just don't be particular about the date. Even when I was engaged, there was competition from girlfriends, parents, and my fiance to take me out "on the day" or "that weekend." Don't presume she's free for you on her birthday.
Something trivial and cute: a Buddhist figurine, a knickknack, a flower you picked. By advice from my female friends, NOT jewelry: jewelry means you're serious.