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 guide, photos, videos & research.

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 a World of Gems. Our collection includes an array of natural gemstones ranging from well-known precious stones like sapphire, diamond, ruby, and emerald to unique and beautiful semi-precious options. It includes faceted, cabochon and carved gemstones.

We are the authority in gemstone engagement rings, natural gemstone, and gemstone jewelry, since 1939. We have the largest collection of gemstone found online.

Explore our multi-color gemstones, each a natural masterpiece with unique, dazzling hues. From sapphires to rubies, they elevate jewelry with elegance.

Explore our vast collection of natural gemstones, each handpicked for its unique beauty and rarity. From timeless classics to rare finds, discover the perfect gem that speaks to you.

May 8, 2023 · Natural gemstones can be categorized into two primary categories: precious and semi-precious. While precious gemstones exhibit rarity, durability, and beauty, semi-precious gemstones might not possess all three qualities. Common examples of precious gemstones include alexandrite, aquamarine, emerald, diamond, ruby, sapphire, topaz, and opal.

Aug 4, 2022 · Let’s dig in with our guided list of the rocks, minerals, and gemstones of Illinois and help you get started on researching a good place to dig! Minerals and Gemstones Found In Illinois 1. Fluorite

Buy affordable natural loose Gemstone Lots for jewelry in calibrated sizes from the largest selection available online. We have all the popular gemstones - sapphires, rubies, garnets, amethyst and citrine - in all shapes and sizes ideal for any jewelry item you can imagine.

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