New to gemstones? Curious about the different kinds of gemstones? Check out our gemstones list and discover a world of precious and semi-precious stones.

GIA’s Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe. Each precious stone page features additional detailed gemological information, a buyer’s …

Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster.

Articles about gemstones written by a GIA Graduate Gemologist. Each article includes photos and information about the gem's physical properties and geologic origin.

Gemstone List: A Complete Gemstones List with Images. Our gemstone list features over 200 precious and semi-precious varieties, a comprehensive index to find the ideal colored stone. Whether for …

Dec 26, 2025 · gemstone, any of various minerals highly prized for beauty, durability, and rarity. A few noncrystalline materials of organic origin (e.g., pearl, red coral, and amber) also are classified as …

Jan 24, 2025 · Discover the 50 most valuable gemstones and minerals found in the U.S., including their descriptions, locations, estimated values, and where to find them. Perfect for rockhounding and …

The gemopedia is the gemstone encyclopedia for any and all gemstones found across the globe. Find the facts, varieties, physical properties.

Explore gemstones, their properties, formation, identification methods, and major types. A complete beginner-friendly guide to the world of natural gems.

Oct 15, 2025 · Explore the main types of gemstones, their properties, classifications, origins, and uses in jewelry. Learn the difference between precious and semi-precious stones, how to identify …