Id go with the elsa peretti pearls by the yard bracelet as my first pick because its simple, elegant and oh so classy.. A few of my friends have it and they wear it everyday. As long as you arent careless with your jewellery or work in an environment where it might catch on stuff all the time, it should be fine.
My 2nd choice would be the Return to Tiffany heart bracelet, cos its a charm bracelet, its a classic tiffanys piece and you can have the heart engraved to personalise it a little bit. Also, its super strong, so you can wear it all the time without having to worry about it. It suits all ages as well, so dont worry about it being too young.
In terms of the rings, i love the elsa peretti heart ring, the large one that doesnt close up all the way. I have it in gold, and i love it! Its a truly unique design and it looks great. Try wearing it on the middle finger or index finger as I do, its a funky sort of ring.
Theres my 2 cents worth, good luck choosing!