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“Worms” in Opal
Near-colorless heulandite crystals in an Ethiopian opal resemble the segmented bodies of worms.
Cat’s-Eye Boulder Opal
A precious cat’s-eye boulder opal from Australia is examined in the Carlsbad laboratory.
Natural Opal with Unusual Play-of-Color Pattern
Play-of-color pattern in Ethiopian opal is reminiscent of a turtle’s shell.
Black Opal with Unique Play-of-Color
A black opal cabochon set in a ring displays vivid orange play-of-color.
Intarsia Jewelry Box by Nicolai Medvedev and Susan Helmich
Blue Opal from Chile
Precious Opal from Pedro II, Brazil
Slovak Opal: A New Life for a Historical Gem
Reports on the recent production of precious and common opal from a centuries-old locality.
A New Treatment: Creating Phantom Structure in Opal
A newly developed treatment creates a phantom structure in opal visually similar to natural phantom opal.
Rare Double Pseudomorph Ikaite-Calcite-Opal
In Memoriam: Andrew Cody
Conversation with True Blue Opals and Gems
At the AGTA show, we spoke with Natassa Patel, who along with her mother, Salma, owns and operates True Blue Opals and Gems.
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