Gold/Pure Gold: Incredibly soft, pure gold (Au, atomic number 79) is most often combined with other metals when used in jewelry. Yellow Gold: Includes copper, zinc, and silver; looks the closest to pure gold. Yellow gold tends to fall in and out of favor as tastes change, but its look is the most familiar and recognizable as “gold.” Pink/Rose/Red Gold: Include copper and small amounts of silver. (Red has more copper for a deeper hue.) These hues are “hipper” these days than yellow gold, though tastes/fads tend, of course, to be cyclical.White Gold: Includes palladium, nickel, and silver, often with a rhodium coating for color. Wearing white gold is a great way to, well, hide the fact that what you’re wearing is gold. (Which begs the question: Why? But white gold looks killer, so who cares.) Gold-Plated: A piece of metal (or other material) that has been coated in a thin layer of gold via chemical or electrochemical plating is considered “gold-plated.” In jewelry, the gold’s thickness is measured in microns: A gold-plated watch typically features a layer of gold no less than 0.5 microns thick.Gold Vermeil: Similar to gold plating, but generally featuring a layer of gold thicker than 2.5 microns. PVD: Physical vapor deposition is a type of coating in which a material is vaporized and then applied to another material in the form of a film via a vacuum — i.e. gold being applied to steel. (“IP coating” describes a similar process.)Two-Tone: A combination of gold and another metal, oftentimes steel. Karat: A fractional measure of gold purity.24 Karat: 100% pure gold18 Karat: 75% gold, 25% alloys14 Karat: 58.3% gold, 41.7% alloysGold-Plated WatchesTest the precious-metal waters without breaking the bank with these gold-plated pieces.