White and Colored Diamonds
Gemological Institute of America – The Essential 4Cs
Natural Color Diamond Association (NCDIA)
Colored Gemstones
International Gem Society – How Rare is that Gem?
The Opal Association of Australia
Federal Trade Commission (FTC)
Guides for the Jewelry, Precious Metals and Pewter Industries
Better Business Bureau
In the Loupe: Advertising Diamonds, Gemstones and Pearls
Miscellaneous Other Jewelry-Related Sites We Like:
Gem Select – For loose precious and semi-precious gemstones.
Heart Rings – Your heart-shaped ring source.
Citrus Avenue Collectibles – Specializing in Affordable Vintage Jewelry
The Glass Rings Shop – Murano Style Glass Rings, Glass Dome Rings, Foiled Glass Rings