How do Gemmologists identify gemstones?

Gemmologists often figure out what a gemstone is by checking certain optical and physical traits, and they use tools like refractometers, polariscopes, spectroscopes, plus high-powered microscopes to look closely at how the crystal structure sits and how light behaves inside it.

The whole process is really anchored in a kind of process of elimination, like ruling things out step by step. A refractometer measures how light bends through the stone, and it gives a number index that links up with particular mineral groupings. Microscopes then show diagnostic inclusions, and more specialised equipment such as Raman spectrometers can act like a definite molecular “signature”, separating natural gems from advanced lab synthetics.