All About Gemstones: Gemology

This section of All About Gemstones is designed to provide a detailed overview on the subject of basic gemology, crystal formation, crystal growth habits, geology, and the geography associated with gemstone occurrences.

We have also included a knowledge-base on gemstone grading and gemmological analysis and data, mining technologies, gem mine locations, and other peripheral information related to gemology and gemological evaluation.

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Gemology Gem Crystallography, Chemistry & Physical Properties Crystalline Structures & The Crystal System Crystal Habits - Crystal Growth Patterns Crystal Forms Mohs Hardness Scale Gemstone Durability Cleavage in Gemstones Fracture in Gemstone Mineral Classification - Gems by Mineral Class Ruby Heat-Treating, Fracture-Filling, and Flux-Healing Terminology Glossary - Gemology Vickers Hardness Test for Metals Periodic Table of Chemical Elements Gem Optical Properties Color in Gemstones and Minerals Refractive Index of Gemstones Birefringence in Gemstone Pleochroism, Dichroism & Trichroism Diaphaneity or Transparency in Minerals Gemstone Enhancements & Treatments Geology The Rock Cycle Igneous Rock Metamorphic Rock Sedimentary Rock Gem Mining, Cutting & Grading Gem Extraction Diamond Mining Technology Diamond Geology & Kimberlites Worldwide Diamond Mines & Mining History Lapidary & Gem Cutting AGS Diamond Grading Report Fancy Gem Cuts & Fantasy Cuts Patented Signature Diamond Cuts Old European Diamond Cuts Lapidary Equipment Gemological Testing Equipment Gem Cutting Technology, Equipment & Techniques Ultrasonic Cleaners, Steam Cleaning & Polishing Cloths Gem Grading Colored Gemstone Grading Certificates & Reports AGS Diamond Grading Report Sapphire Enhancements & Synthetic Sapphire