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Opal
Fireworks. Jellyfish. Galaxies. Lightning. Opal's shifting play of kaleidoscopic colors is unlike any other gem.
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Research
Blue Opal from Chile
Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color
Preview of Nature Art Science with Paula Crevoshay
Land of Origins: A Gemological Expedition to Ethiopia
Documents a visit to the sapphire, opal, and emerald mining and trading areas of Ethiopia.
Summer 1986 G&G Lab Notes
Gemstone Durability: Design to Display
Snowflakes in Opal
Fall 2002 Gem News International
"Opalite": Plastic Imitation Opal with True Play-Of-Color
Spring 2000 Gem News International
