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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
Opals from Opal Butte, Oregon
Recent mining at Opal Butte in northeastern Oregon has produced a wide variety of large flawless opals.
Gemstone Durability: Design to Display
Summer 1986 G&G Lab Notes
Jewelry Television in Tucson
Written Characters in Black Opal
Preview of Nature Art Science with Paula Crevoshay
Snowflakes in Opal
Chrysoprase and Prase Opal from Haneti, Central Tanzania
Winter 2011 G&G Lab Notes
An Opal-Calcite Composite
Opal Description
Opal is known for its unique display of flashing rainbow colors called play-of-color. There are two broad classes of opal: precious and common. Precious opal displays play-of-color, common opal does not.
