1. a person who studies, identifies, and evaluates gemstones and precious stones
Usage: Also spelled 'gemologist' in U.S. English; Professional field in jewelry and mineralogy

Examples

• The gemmologist examined the diamond under a microscope to determine its authenticity.
• She trained as a gemmologist and now works for a major jewelry house.
• A certified gemmologist can identify the origin and quality of rubies and sapphires.
• The museum hired a gemmologist to catalog and appraise its collection of rare stones.
• Before buying the emerald, they consulted a gemmologist to verify its value.