The most common question I get asked is "what does 14k gold-filled mean?".
Let me start by letting you know what it is not. It is not gold plated which is a far inferior product that is applied differently and will peel off or tarnish.
Even though the name gold-filled implies the material is filled with gold, the real 14k gold is on the outside. Gold-filled is made by heat and pressure bonding a thin layer of 14k gold to base metal core. That is why it is very important all my materials are made in the USA where the base metals used are safe and legal. Importing which is less money, is risky because you do not really know what you are getting.
Gold-filled is more valuable than gold-plated because it has an actual layer of 14k gold, not just a microscopic film, as is the case with gold-plated items. This process is monitored and regulated where plating jewelry generally is not.