The House of Tibara  
   Facts about opal include chemical make-up, buying advice, cutting and polishing basics, and opal care. Includes photos of different types of opals.
   http://www.opal-tibara.com/

Diamond Review  
   Diamond buying guide includes a price database, diamonds tutorial, and diamond FAQ.
   http://www.diamondreview.com/

Charles and Colvard Created Moissanite  
   Facts about the company's lab created Moissanite. Includes photos of individual gemstones and finished jewelry.
   http://www.moissanite.com/

Evaluating a Diamond: Color  
   Use this information to learn how diamond color is judged. Includes visuals to aid understanding. Also discusses factors that affect color perception.
   http://www.diamondexpert.com/articles/color.html

How Stuff Works: Moissanite Jewels  
   Five-part, illustrated guide that discusses the origin of natural Moissanite and explains how it is being created in the lab today.
   http://www.howstuffworks.com/moissanite.htm

DiaInfo.com  
   Information to help make shoppers aware of simulated stones and of diamonds that might have received undisclosed treatments to improve their appearance.
   http://www.diainfo.com/

Guide2jewelry  
   Buying tips and facts about diamonds, colored gemstones, pearls, and jewelry.
   http://www.guide2jewelry.com/

YourGemologist.com  
   A reference library covering natural gemstones and minerals, synthetic and treated gems. Also offers resources for people who would like to pursue a career in gemology.
   http://www.YourGemologist.com/

Buy a Diamond  
   Diamond buying advice. Includes facts about the origins of diamonds and how the stones progress from rough to cut.
   http://www.buyadiamond.net/

The 4C's of Diamonds  
   Explains cut, clarity, carat weight and color.
   http://shopandbuydirect.com/diamonds.htm

Jewelers of America  
   A collection of advice about buying many types of fine jewelry.
   http://www.jewelers.org/ja_consumer/fineinfo.html

Ask Mr. Jewelry  
   Photos and buying advice for diamonds and other gemstones. Includes traditional birthstone and anniversary lists and articles to help consumers make gemstone selections.
   http://www.askmrjewelry.com

Diamond Info.org  
   Buying tips and educational guidance for diamonds and diamond engagement rings. Includes a community forum.
   http://www.diamondinfo.org

Costellos Australian Jewelers  
   Jewelry store that offers educational articles to give consumers the facts about the products they sell. Library of articles about diamonds, pearls, and opals.
   http://www.costellos.com.au

World's Largest Diamonds  
   Photographs and historical background for some of the world's largest known diamonds.
   http://www.worlds-largest-diamonds.com/

Diamond Tutorials.com - About Diamonds  
   Consumer's guide on buying loose gemstones, rings and engagement bands. Talk forum and quotes.
   http://www.diamondtutorials.com/

Gemological Institute of America (GIA)  
   A nonprofit organization that offers gemstone identification and buying advice to consumers and training to those in the jewelry trade. The GIA provides lab services to the jewelry industry.
   http://www.gia.edu

Diamond Buying Guide  
   Details to help shoppers select and buy a diamond. Topics include diamond grades and diamond quality, and a quiz helps shoppers determine if they've mastered the information.
   http://www.thediamondbuyingguide.com/

Idazzle.com  
   Provides basic information to help familiarize buyers with the qualities they should look for when searching for a diamond.
   http://www.idazzle.com/

Diamond Legend  
   Details about famous, legendary, and celebrity diamonds, as well as diamonds mentioned in poetry.
   http://www.diamond-legend.info

Colored Gemstones  
   The International Colored Gemstone Association (ICA) provides consumer buying advice and educational details about colored gemstones.
   http://www.gemstone.org/index_gemsite.html

Enchanted Learning  
   An illustrated glossary, including terms that describe fine and costume jewelry, gemstones, and jewelry making.
   http://www.enchantedlearning.com/jewel/

The Center for Jewelry Studies Discussion Board  
   Forum where visitors can discuss the history, identification, and marketing of antique, period, and vintage jewelry.
   http://www.center4jewelrystudies.org/board/?topic=topic1

Diamond.com - Learning Center  
   Educational materials to help buyers select and care for diamonds, watches and other jewelry.
   http://www.diamond.com/learncenter.asp?Sn=98592638&fn=_learncenter_home.htm

Gem Gallery - The Image.com  
   Photos of gemstones, each accompanied by a description of the gem's properties and where it is commonly found. Includes instructions for close-up gem photography.
   http://www.theimage.com/gemstone/gemstone.html

CanadaDiamonds.com  
   Diamond basics, covering the 5 C's--carat weight, color, clarity, cut and cost.
   http://www.canadadiamonds.com/diamond_tutorials.htm

About Jewelry and Accessories  
   Provides facts to help consumers evaluate and purchase gemstones, jewelry, watches and related accessories.
   http://jewelry.about.com

Diamond Treatments  
   An explanation of the treatments commonly used to improve the appearance of a diamond. Additional links lead to more facts about diamonds.
   http://www.nexxdesign.com/stones/diamond_treatments.htm

JadeMart.com  
   An explanation of the different grades of jade used in jewelry, with tips to help buyers distinguish between them.
   http://www.jademart.com

Soyouwanna Buy an Engagement Ring  
   Multi-page article that offers engagement ring buying advice.
   http://www.soyouwanna.com/site/syws/ring/ring.html

Antique Jewelry Online  
   Jewelry history features take readers through the popular styles during specific eras. Also includes gemstone lore and articles about materials used to make jewelry.
   http://www.antiquejewelryonline.com/learn/learn.htm

PriceScope  
   Includes numerous diamond tutorials and buying tips, a discussion forum, and a cut advisor.
   http://www.pricescope.com/tutor_cert.asp

Emporia State University - Everything about Diamonds  
   A tutorial about the history and characteristics of diamond. Includes facts about diamond mining.
   http://www.emporia.edu/earthsci/amber/go340/diamond.htm

Diamond Cutters International  
   Educational articles to help consumers choose a diamond.
   http://www.diamondcuttersintl.com/

Diamond Engagement Rings Guide  
   Provides information on choosing and buying diamonds and engagement rings online or in jewelry stores. Offers email newsletter.
   http://www.diamond-engagement-rings-guide.com

The Jewelry Box Newsletter  
   Features tips on buying diamonds and jewelry, gemstone facts and cleaning silver.
   http://www.jewelrynewsletter.com

Promise Rings  
   Learn their meanings, history, traditions, current practices and where to buy them.
   http://www.promise-rings.info/

RingDesigner.com  
   Describes the 4Cs of diamonds (cut, clarity, carat and color) and some information about certification.
   http://www.ringdesigner.com/Pages/Understanding_Diamonds.htm

Igloo Diamonds  
   Igloo offers details about the history of Canadian diamond mining and what's required for diamond certification in that country.
   http://www.diamonds.ca/aboutcanadian.htm

The Guide to Buying Fine Jewelry Online  
   Provides information on how to choose, buy and care for fine jewelry, from diamonds, pearls, precious gems, semiprecious gemstones, platinum, yellow and white gold to sterling silver.
   http://www.anyamani.com

Better Business Bureau (BBB)  
   Provides a description of traditional jewelry metals, diamonds, and pearls, and includes advice to help consumers make decisions when buying and repairing jewelry.
   http://www.bbb.org/alerts/article.asp?ID=441

American Gem Trade Association  
   The Natural Colored Gemstone and Cultured Pearl Source of Information and Ideas.
   http://agta.org

Diamond Information and Education  
   Learn and discuss about diamonds & diamond Jewelry through education tutorials,articles, chat, forums and informative faq's
   http://www.diamondchatforum.com

Diamond and Gemstone Facts and Curiosities  
   Facts about formation, mining, cut, treatment and care of precious gems. Famous diamonds, diamond rings, the 4C’s, birthstone chart, emerald jewelry, engagement rings, fine jewelry stores, gem stone scams, natural gemstones buying guide.
   http://www.finejewelrydesigns.com

LoveAndDiamonds.com  
   Diamond engagement rings buying guide includes a diamonds tutorial as well as related articles and resources.
   http://www.loveanddiamonds.com/

Jewelry Pearls  
   Discussion forum for gemstones and precious metals. Includes birthstones, astrological, and anniversary considerations.
   http://www.jewelry-pearls.com

Name on Rice Jewelry Online Buying Guide  
   Read reviews, ratings, and comparisons of numerous online "Name on Rice" jewelry web sites in the online buyer's guide.
   http://www.nameonricejewelry.com