Ammolite is a rare, iridescent, gem-quality material cut from the foss... Large colorless crystals of Analcime are a great rarity although small... Anatase occurs in many beautiful colors, such as deep indigo and amber... Strongly pleochroic, andalusite can show shades of green, brown, and r... These feldspars are rarely encountered in gem form.

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. Actinolite is a rare translucent variety of chatoyant actinolite.

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.

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.

There are over 300 types of minerals that have been used as gemstones. Such as: There are a number of artificial and lab grown minerals used to produce gemstones. These include: There are a number of organic materials used as gems, including: Some rocks are used as gems, including:

100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure. Gifts That Rock - What are the most popular gift items in the Geology.com store? Bloodstone is a dark green jasper with a splatter of red color that looks like blood. Polka Dot Agate - a translucent blue to white agate with a suspension of colorful dots.

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.

2019年11月26日 · Precious stones were hard, rare, and valuable. The only "precious" gemstones are diamond, ruby, sapphire, and emerald. All other quality stones are called "semiprecious," even though they may not be any less valuable or beautiful.

2020年2月1日 · Due to their high values, a lot of people think that gemstones like diamonds, emeralds, sapphires and rubies are the rarest in the world. Initially, I thought this as well, but after a little research, I was amazed to learn that they’re not even close. In fact, there are at least a dozen gemstones far rarer and more valuable than diamonds.

Welcome to the definitive online guide to crystals, stones, and minerals. Below you will find an ever-growing list of crystals. Each crystal type links to an encyclopedia page with everything you would ever want to know about that crystal. This includes its history, healing properties, meditation uses, and much more.