The Portuguese Crown Jewels are a pretty nice collection, to bad the best parts were stolen. Just imagine if the Monarchy was restored D. Isabel with the sapphires hanging off her circle necklace and the star tiara on her head. Such a shame these pieces are poorly hidden (according to D Duarte) and aren't on display for people to see. If these jewels were displayed it would attract more people to the Palace da Ajuda (including me lol).
Here are 2 links with good pictures of Jewels from Palcio da Ajudas collection.