Tammy Thủy Tresor (Nguyen) on Instagram: "A gemologist is a professional who studies, identifies, grades, and evaluates gemstones. Their expertise covers both the scientific and aesthetic aspects of gems, blending knowledge of mineralogy, geology, physics, and chemistry with an eye for beauty and craftsmanship. Key aspects of what a gemologist does include: • Identification: Using specialized instruments (like microscopes, spectroscopes, and refractometers) to determine what type of gemstone som