The difference between fashion jewelry and Fine jewelry is the quality of the metal used in the jewelry and the authenticity of the stones set into the pieces.
Items considered to be Fine jewelry are constructed high levels of gold, sterling silver, or platinum plating. Fashion jewelry is simply painted on, low levels of silver and gold, if any of either is used at all.
Stones must be natural gemstones, which possess all the visual, chemical, and physical properties of mined gemstones to be categorized as fine jewelry.
Since they are natural, cultured pearls are categorized as fine jewelry. All natural diamonds are considered to be fine jewelry.
Fashion Jewelry falls in the middle. While fine jewelry base metals are gold and silver, fashion jewelry is plated metals, plated with pure gold and real silver.
For Instance, A gold ring with coral gemstone is classified as Fine Jewelry
On the other hand a gold plated brass ring with same coral gemstone is Fashion Jewelry