What does a Spectrometer do?

• A. A device for measuring weight of gems.
• B. A camera for taking gem photos.
• C. A machine that carves gems.
• D. A highly sensitive instrument that analyzes a gem's radiation absorption.

Answer: (D)

A spectrometer measures how a gem interacts with light by analyzing how much radiation it absorbs across different wavelengths. In gemology, this absorption pattern acts like a fingerprint, helping to identify the material and reveal treatments or enhancements because different elements and crystal structures absorb light in characteristic ways. So it’s a highly sensitive instrument that analyzes a gem's radiation absorption. It’s not about weighing, taking photos, or carving—that would be a scale, a camera, and a lapidary machine, respectively. By looking at the absorption spectrum (and related signals like fluorescence under UV or infrared absorption), a gemologist can determine identity, detect color-causing impurities, and spot treatments.