In terms of quality, pure gold is too soft to work with so jewelry is made using a blend of metals which affect not only the color but the hardness of the gold. Most of the gold that's sold in Europe is 18 karat, which means it's 75% gold and 25% other metals. Portuguese gold, on the other hand, is 19.2 karat, or 80% gold and 20% other metals.
W. Wins — I buy a couple pieces of jewelry from them it's all very nice quality I'm happy with it