Gift for my best friend's 18th birthday help please!!

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I change my original answer (originally chose the heart), I was looking at the wrong olive leaf pendant. I like this olive leaf pendant a lot. It's simple and small enough that she could wear it with any sort of outfit but it's still unique looking and I like the symbolism of an olive leaf/branch. So that would be my first choice and my second choice would be the heart.
 
- The Paloma Picasso Olive Leaf mini but the one leaf thing?
This one. Out of all the styles you've listed, as she gets older, this style would stay timeless and classic. That, and I love what the meaning of an olive branch/leaf stands for, especially since you're giving it your best friend.
 
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