Aragonite is more commonly found as a constituent of pearl and shell nacre than as a crystal suitable for gem […]

Named after the color of sea water, aquamarine is the blue to blue-green member of the beryl family. Readily available

Although not suitable for jewelry, apophyllite is a popular collector’s piece. Perhaps the whitest of all gems, some cut specimens

Although too brittle for most jewelry use, properly cut apatite gems are truly magnificent. A collector could assemble a suite

The rarest plagioclase feldspar, anorthite is very rarely faceted.

Rare and difficult to cut, anhydrite is seldom faceted. However, this material can be carved into beautiful objects. “Angelite,” a

Anglesites with pale colors can show great dispersion and brightness, they’re difficult to cut and inadvisable to wear. Faceted pieces

Andradite is one of the most sought after garnet species. Although more sources have been discovered in recent decades, gem-quality

These feldspars are rarely encountered in gem form. Andesine’s occurrence is widespread throughout the world, in a great variety of

Anatase occurs in many beautiful colors, such as deep indigo and amber yellow. However, these rare gems are seldom transparent