Rough and Tumble Opal Thumbnail | Welo Zone, Amhara Region, Ethiopia | SiO2 · nH2O | Opal Specimen

Ethiopian Opal is the form of mineral silica, and it contains 3% to 21% of water in itself. This type of opal is stable and does not need to be kept in water as it has been carefully processed to make that unnecessary. These thumbnails include a raw and a cabochon version, so you can use one for display and one for jewelry.
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The name comes from the Greek word opallios, meaning *to change color*, which these most certainly do with a wild color play.
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Metaphysically The ancient Greeks thought the stone could give people the gift of prophecy and protect them from disease.