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.

2025年1月2日 · Arizona is a gemstone hunter’s paradise! With its diverse and abundant geological formations, our state is home to a variety of gems that can be found in different locations. From the depths of its canyons to the tops of …

Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!

Synonyms for GEM: jewel, rock, brilliant, gemstone, jewelry, trinket, bauble, cameo; Antonyms of GEM: rough, lemon, loser, display, simplify, reveal, streamline, strip

2021年4月26日 · Even the most general definition of a gem has many exceptions. Learn what qualities have been used to identify gemstones both scientifically and popularly.

Information and educational services for everyone interested in gemstones. For gemologists, hobbyists, jewelers, lapidaries and everyone in between. Learn how to get started with the International Gem Society’s guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!

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

Established in 1931, GIA is an independent nonprofit that protects the gem and jewelry buying public through research, education and laboratory services.

A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments.

2025年2月26日 · 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 gemstones. Gemstones have attracted humankind since ancient times, and have long been used for jewelry.