“Emerald alternatives” are other natural stones with a green color that are purchased by people who simply want a green gem. They might prefer to own an emerald, but they select the alternative stone instead because of its lower price or other characteristics.
Chrome diopside and chrome tourmaline are deep green gems that some people purchase when they want a green gem. Tsavorite garnet is another gem with a wonderful green color. Dyed quartz can be a beautiful stone at a very low cost.
Several examples of alternative stones and synthetic emerald are shown in the nearby photo. The best rule for buying gemstones is: “Buy what you like!”