American Gem Trade Association - The natural colored gemstone and cultured pearl source of information and ideas.

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.

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.

Buy a Diamond - Diamond buying advice. Includes facts about the origins of diamonds and how the stones progress from rough to cut.

CanadaDiamonds.com - Diamond basics, covering the 5 C's--carat weight, color, clarity, cut and cost.

Colored Gemstones - The International Colored Gemstone Association (ICA) provides consumer buying advice and educational details about colored gemstones.

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.

DiaInfo.com - Information to help make shoppers aware of simulated stones and of diamonds that might have received undisclosed treatments to improve their appearance.

Diamond Info.org - Buying tips and educational guidance for diamonds and diamond engagement rings. Includes a community forum.

Diamond Information and Education - Learn and discuss about diamonds and diamond jewelry through education tutorials,articles, chat, forums and informative FAQ's

Diamond Review - Diamond buying guide includes a price database, diamonds tutorial, and diamond FAQ.

Emporia State University - Everything about Diamonds - A tutorial about the history and characteristics of diamond. Includes facts about diamond mining.

Enchanted Learning - An illustrated glossary, including terms that describe fine and costume jewelry, gemstones, and jewelry making.

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.

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.

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.

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.

Idazzle.com - Provides basic information to help familiarize buyers with the qualities they should look for when searching for a diamond.

JadeMart.com - An explanation of the different grades of jade used in jewelry, with tips to help buyers distinguish between them.

JewelInfo4U - Informational site with articles by volunteer editors from the jewelry industry. Includes articles on gemstones, buying guides, help for men, and common questions.

The Jewelry Box Newsletter - Features tips on buying diamonds and jewelry, gemstone facts and cleaning silver.

Jewelry Buying Advice - Provides information to help consumers evaluate and purchase gemstones, jewelry, watches and related accessories. From About.com.

LoveAndDiamonds.com - Diamond engagement rings buying guide includes a diamonds tutorial as well as related articles and resources.

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.

PriceScope - Includes numerous diamond tutorials and buying tips, a discussion forum, and a cut advisor.

Promise Rings - Learn their meanings, history, traditions, current practices and where to buy them.

RingDesigner.com - Describes the 4Cs of diamonds (cut, clarity, carat and color) and some information about certification.

Soyouwanna Buy an Engagement Ring - Multi-page article that offers engagement ring buying advice.

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.