18Kjewelry Co.,Ltd. - provides a collection of blue sapphire, ruby, and tri-color jewelry.
American Gem Society: Ruby Information - includes information on color, famous rubies, and sources.
De'Nicole Designs, Inc. - custom work in diamond, ruby, emerald, and colored gemstone jewelry.
Death of the Thai Ruby - essay by Richard W. Hughes takes a hard look at Thailand's ruby mines.
Gemstone Education: Ruby - history, color, sources, and famous rubies.
Meyson Jewellery - jewelry information and a wide range of selected gold, sapphires, rubies, and emeralds.
Nebraska State Geological Survey: Ruby - illustrated guide to this rare red gem.
Refractal Design, Inc - fractal jewelry in gold, platinum, diamond, sapphire, silver, and ruby.