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.

Dec 26, 2025 · Gemstone, any of various minerals highly prized for beauty, durability, and rarity. A few noncrystalline materials of organic origin (such as pearl and amber) also are classified as gemstones.

Jun 23, 2022 · Gemstones are minerals, rocks, and other organic materials that are cut and polished to create pieces of jewelry and other attractive accessories for clothing or decorative ornaments.

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 …

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

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.

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 …

Jun 29, 2025 · Discover gemstones, how they're formed, and why they captivate us. Learn about their types, meanings, care, and cultural significance.

Dec 29, 2023 · Gemstones encompass a world of diversity, each type possessing its unique characteristics and charm. From the fiery brilliance of rubies to the serene depths of sapphires and …