I would have to agree that a 6.0mm to 7.0mm Freshwater pearl is a good choice. However, you might also consider going in the other direction.
My wife is also petite and you would be surprised at how good pearls that are 10mm - 12mm look on her.
So, while a full strand of 10-12mm pearls may be outside your price range, there is another great alternative - a single 11mm or 12mm Golden South Sea pearl on a gold chain. Very classy and a favorite of my "petite" wife
