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Explore the science and lore of gemstones from across the globe with GIA's Gem Encyclopedia. Find detailed information, photos, videos and buyer's guides for each precious stone.
Find detailed information for any gemstone you are interested in, from actinolite to zircon. Browse the alphabetical list of gem profiles, buying guides, and photos of precious and semi-precious stones.
Gemstones are often treated to enhance the color or clarity of the stone. In some cases, the treatment applied to the gemstone can also increase its durability. Even though natural gemstones can be transformed using the traditional method of cutting and polishing, other treatment options allow the stone's appearance to be enhanced.
Learn about the geology, properties, and uses of various gemstones from around the world. Browse photos, articles, and links for birthstones, diamonds, opals, rubies, sapphires, and more.
Learn about gemstones, their formation, identification, and value from GIA, the leading authority on gems and jewelry. Explore research, news, charts, and features on various gem varieties, such as peridot, emerald, and diamond.
Learn about gemstones, the minerals highly prized for beauty, durability, and rarity. Find out how they are cut, polished, and enhanced, and what are the most important and popular types of gems.
Learn about the healing, spiritual, and metaphysical properties of over 100 different gemstones and crystals. Find out how to use them for personal growth, wellness, and transformation.
