14k gold-filled contains a layer of 14k gold that has been bonded by pressure to a base metal.  The layer of gold is 100x thicker than plated jewelry.  It will not peel or flake off.  It is a wonderful, less expensive alternative to 14k solid gold.Things to note about 14k gold-filled pieces: I use 14k yellow gold solder for all my gold rings. Because of the layer of gold on the pieces, I can not perfectly sand/file down the solder joints, as it will expose the base metal underneath.  You will see a slight difference in color, but it will be at the bottom of the ring and not visible, when wearing it. Please understand this, when purchasing 14k gold-filled items.