As part of the Burke Museum's site on Geology, this page details the birthstones for each month and discusses both the myth and the history behind birthstones.

Article on the mineral beryl with a section on aquamarine, which is a variety of beryl.

Site provides many fun facts about the gem peridot, including information on its history and physical and metaphysical properties. Also provides a picture of the gem itself.

This commercial page gives information about the physical properties of zircon, its appearance, and where it can be found. Includes pictures and tables.

This commercial site gives a brief description of moonstone with pictures of finished stones.