A gemologist is a scientist who studies gemstones: the precious and semi-precious stones like diamonds, rubies, emeralds, and sapphires that jewelers use in rings, necklaces, and other jewelry. Gemologists learn to identify different stones, determine their quality and value, and spot whether a gem is natural or synthetic (made in a laboratory).

To become a gemologist, you need special training in how to examine stones using scientific tools. A gemologist might use a microscope to look for tiny marks inside a diamond that show it's real, or use special instruments to measure how light passes through a ruby. They study a gem's color, clarity (how clear it is), cut (how it's shaped), and carat (its weight) to determine its value.

Gemologists work in jewelry stores, auction houses, museums, and laboratories. When someone inherits a ring and wants to know if the diamond is real or what it's worth, they bring it to a gemologist. Some gemologists travel to mines around the world, while others work as detectives of sorts, figuring out whether ancient jewelry is authentic or fake.