Other
International Colored Gem Association: Birthstones
This site will identify your birthstone based on a particular birth date and provide information on that gem. More information can be learned about that gem, and others, in their Gem Library.
Other
International Colored Gemstone Association: Topaz
This site gives a historical perspective of topaz, as well as its physical properties and where it is found. Also provides more information and pictures of the gem itself.
Wikimedia
Wikipedia: Ruby (Gemstone)
This site from the Wikipedia encyclopedia gives a definition and information on hardness, value determination, and natural versus artificial rubies. Links are provided throughout for additional information on related subjects.
Jewelry Central
Jewelry Central: Amethyst
Information on this commercial site gives the physical properties and origin of the amethyst, as well as some of the mythical and metaphysical properties ascribed to the gemstone.
Jewelry Central
Jewelry Central: Opal
This page contains information about the opal, including the gemstone's historical importance and physical properties.
Jewelry Central
Jewelry Central: Moonstone
An article on a commercial site describing the physical characteristics of this gemstone, along with its historical and metaphysical properties.
Jewelry Central
Jewelry Central: Emerald
A commercial site giving information on the physical properties and history of emeralds. Includes details on the cuts and valuation of these gems.
Other
Icga: Jade
This thorough site covers the history of jade along with how jade is sold and used today.
Other
Gems Brokers: Zircon
Properties, myths, and facts of zircon are depicted in this commercial site.
Other
Icga: Peridot, Extraterrestrial Gem
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.
Jewelry Central
Jewelry Central: Peridot
This site contains information on peridot including its physical and metaphysical properties.
Jewelry Central
Jewelry Central: Sapphire
This commercial site contains information about the sapphire's physical properties and where it can be found. Also discusses the history and romance related to the stone and includes a description of its quality.
Jewelry Central
Jewelry Central: Ruby
This commercial site gives information on rubies, including their physical properties and where they are found. Includes some details on how to choose a ruby for purchase.
Jewelry Central
Jewelry Central: Diamond
Discusses in detail the grading of diamonds, as well as briefly discussing their structure, physical properties, and historical background. Accompanied by clear illustrations.
Jewelry Central
Jewelry Central: Topaz
This commercial site contains information about the physical and metaphysical properties of topaz, along with where it is found. Discusses the different color variations, and how this gem is enhanced to make it blue.
Jewelry Central
Jewelry Central: Zircon
This commercial site contains information on zircon including its history, physical and metaphysical properties, and where it can be found.
Jewelry Central
Jewely Central: Garnet
This commercial site provides a brief description of the garnet, along with historical background on the gem.
Jewelry Central
Jewelry Central: Agate
A commercial site that contains a brief paragraph about agates and photographs of some varieties.
Wikimedia
Wikipedia: Aquamarine and Maxixe
Article on the mineral beryl with a section on aquamarine, which is a variety of beryl.