This category provides product and service information so that consumers can make informed purchasing decisions. It also provides information about service contracts, warranties, recalls, and other product or service information for consumers who already have made purchases. Sites in this category are buyers' guides, decision guides, price comparisons, recall information, or tips and advice. Sites which are primarily promotional in nature, and not significantly useful in making informed shopping choices, can be found in appropriate Business, Regional, or Shopping categories.
Five-part, illustrated guide that discusses the origin of natural Moissanite and explains how it is being created in the lab today. www.howstuffworks.com/moissanite.htm
Facts about opal include chemical make-up, buying advice, cutting and polishing basics, and opal care. Includes photos of different types of opals. www.opal-tibara.com
Use this information to learn how diamond color is judged. Includes visuals to aid understanding. Also discusses factors that affect color perception. www.diamondexpert.com/articles/color.html
Information to help make shoppers aware of simulated stones and of diamonds that might have received undisclosed treatments to improve their appearance. www.diainfo.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. www.YourGemologist.com
Photos and buying advice for diamonds and other gemstones. Includes traditional birthstone and anniversary lists and articles to help consumers make gemstone selections. www.askmrjewelry.com
Jewelry store that offers educational articles to give consumers the facts about the products they sell. Library of articles about diamonds, pearls, and opals. www.costellos.com.au
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. www.gia.edu
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. www.thediamondbuyingguide.com
The International Colored Gemstone Association (ICA) provides consumer buying advice and educational details about colored gemstones. www.gemstone.org/index_gemsite.html
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. www.theimage.com/gemstone/gemstone.html
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