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 …

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

The United States is home to a wealth of natural resources, including many gemstones and precious metals. We’ve highlighted locations where you can find and learn more about some …

Rocks and MineralsGems jewelry Rocks and Minerals explore more for educators

Gems & Gemology is the quarterly scientific journal of the Gemological Institute of America.

In the 45 years since the previous iteration of the gem and mineral halls opened, the scientific fields of mineralogy and geology have advanced significantly, and the new design reflects …

Nov 14, 2013 · Dedicated to the earth sciences, it houses one of the world’s largest gem and mineral collections, including such world-famous gems as the Hope diamond, Logan sapphire, …

This site features a comprehensive overview of gem information, starting with the GIA Gem Encyclopedia, a major new feature that highlights 21 of the most popular gemstones.

Emerald Spanish conquistadors, Inca kings, and pharaohs treasured this rich green gem. See an emerald cross from a sunken ship!

Oct 9, 2012 · The Mohs scale (pronounced MOZE) rates the hardness of gems and minerals. The hardness of a stone indicates the stone’s resistance to scratching or how the surface of the …