In this earth science quiz worksheet, students respond to 20 short answer and true or false questions regarding earth science topics.

Online guide for people interested in the history and valuation of alexandrite gemstones and jewelry.

This page contains information about the opal, including the gemstone's historical importance and physical properties.

The beauty of carved gemstones has captivated craftsmen, collectors, and connoisseurs since antiquity. Precious markers of culture and status, gems were sought by Greek and Roman elites, and are still valued by modern monarchs and...

A gem is a precious or semiprecious stone that has been cut, polished, engraved, or otherwise altered to be used as a personal insignia for making sealings or as decoration. Often imported from afar, ancient gems were truly exotic, and...