Gemstones are valued based on the Four Cs - color, clarity, cut, and carat. Precious stones include diamonds, sapphires, rubies, and emeralds. Semi-precious stones are evaluated on their rarity and ...

Pink ChalcedonyA pink chalcedony shows off its beauty. Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony ...

GIA’s laboratories use advanced instrumentation and research to deliver accurate grading, identification, and origin ...

The Reserve Bank of Malawi (RBM) is set to hire independent assessors to review the authenticity of the gemstones and gold ...