Hi Cutiepie21! Pearls are a great choice, they are a true classic and I wear mine all the time. Cultured pearls are not fake, they are genuine pearls. The thing about pearls is that they are formed when an irritant (like a grain of sand) makes its way into an oyster, which then covers it with nacre (the pearly stuff that gives pearls their sheen and lustre). For cultured pearls, the irritant is manually inserted into the oyster- they are basically guaranteed to form a pearl that way. Non cultured pearls are much more expensive than cultured pearls because there are fewer oysters producing pearls.
If you want to learn more about pearls, try looking at Iridesse.com. They have a lot of information about pearl types, grades, and quality that will help you know what to look for, and they also have a good selection of necklaces at various price points. Pearlsonly.com also has a wide selection.