Ethiopian Wello opals originate from volcanic activity. All volcanic opal is known as “hydroph
Ethiopian Wello opals originate from volcanic activity. All volcanic opal is known as “hydrophane opal”. The term hydrophane comes from the Greek words meaning “water-loving” and describes their ability to absorb water and change from opaque or semi-translucent to translucent or transparent in humid or aqueous environments. Amazingly, some stones will become almost colorless if soaked in water but then retain their original color after a week or two under arid conditions. If you live in a dry or desert like climate these opals will always look great but, if you reside in a rain forest, your stones will look very different. -- source link
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