3) Luxury Jewelries or Precious stones
It is always best to declare upon arrival the carriage of luxury jewelries or precious stones. Also note that if this is in unreasonably excess amount, it may draw certain questions at the checkpoint.
4) Excessive Money or Souvenirs
For certain countries like USA, you must declare your money to customs if it exceeds $10,000 or its equivalent in any foreign currency. In Nigeria, gifts and souvenirs exceeding a value of N50, 000 are likely to be banned by customs; excluding items like camera, smartphones and other luxury goods.