gems, gemology, basic gemology, advanced gemology, gem testing, reproducibility in gem testing, instrument testing and calibration, pearl testing, pearl, pearls, diamond, emerald

With decades of expertise and laboratory locations worldwide, GIA uses more advanced instrumentation that extends far beyond the boundaries of standard gemological testing. The comprehensive analysis of gemstones submitted to the laboratory ensures accurate identification and grading reports. These gemstones fall under five different categories: natural diamonds, natural colored diamonds, laboratory-grown diamonds, colored stones, and pearls.