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.

Picture Identification Guide for Polished Stones and Tumbled Rocks These photos will give you some idea of what various stones look like, but other types of stones can have a very similar appearance. Positive identification requires much more than looking at a photo. Printable Tumbled Stone Identification Chart

A complete list of precious and semi-precious gemstones: Showing over 200 gemstone varieties, our gemstone index will help you find the perfect colored stone for your jewelry, collecting and crystal healing needs.

Welcome to the Gemstone Reference Guide, an information resource for 82 of the most often seen gemstones and gem materials. These pages will provide you with a general understanding of the properties of each gemstone, as well as important information regarding specific testing and evaluation methods that should be applied.

The Mineral and Gemstone Kingdom is a free informational and educational guide to rocks, minerals, gemstones, and jewelry. This site has been providing detailed information and photos of hundreds of mineral and gemstone since 1997 and is one of the leading education resources on minerals and gemstones.

Unlock the secrets of natural gemstones with our detailed identification chart! Discover unique properties, tricks for spotting imitations, and explore various gem categories. 💎

2011年4月1日 · Discover how to identify gemstones with this gemstone identification guide including all the steps and testing for you to identify your gemstones.

National Gem Lab is providing Unique gemstone identification chart to search easily from our search bar to find Refractive Index, Hardness & Specifc gravity