ethiopian water opalWhen I first showed a water opal to a customer, they asked point-blank, "Brother, is there water inside this?" It made me laugh. But honestly, it wasn't a bad question. This stone is so transparent and clear that, at first glance, it doesn't even look like a gemstone.
That very curiosity inspired this guide. What is a water opal? How does it differ from hydrophane opal? How should you buy and care for it? Everything is explained here in simple, easy-to-understand language.
Due to its absorbent structure, water opal is a unique type of opal capable of absorbing water. When submerged, its milky-white base becomes transparent, and it often changes color or becomes more vibrant, making the entire stone appear as if it has come to life. Upon drying, it gradually reverts to its original condition.
This characteristic differentiates water opal from solid, non-porous opals such as Australian Boulder Opal and Australian Black Opal, which do not absorb water. Today, most water opals originate from Ethiopia and Mexico.
Water opals are extremely rare in Australia; they are found in only one small volcanic deposit near Tintenbar, close to Byron Bay. In this blog, we will discuss what water opals are, how they behave when wet, where they come from, and why Ethiopian water opal is a safe and durable choice for buyers.
What is Water Opal?
Water opal is a transparent or semi-transparent opal with little to no body color. Its base is so clear that you can almost see right through the stone. When light enters it, a play of colors occurs, shifting between blue, green, and orange all within a single stone.
Its technical name is hydrophane opal. The word "hydrophane" is derived from the Greek words for water and visible, meaning "reflected in water." This is an accurate description of the process that actually occurs.
Not all opals are hydrophane. Australian opals such as black opal, boulder opal, and white opal from Coober Pedy are not hydrophane. They contain water in their composition, but they do not absorb any more water from outside. They are stable.
Ethiopian opal is the main hydrophane opal on the market today. Specifically, the Welo opal from the Wello Province of Ethiopia, where most Ethiopian opals come from. When people say water opal, they usually mean this opal.
A simple definition: An opal that looks like glass but contains internal flashes of color (fire). It is this very combination that makes it special.
What is Hydrophane Opal? How does it differ from Water Opal?
This part can be a bit confusing. Many people think they are the same thing, but actually, they are different. Water opal is naturally transparent. It doesn't need to be placed in water.
Hydrophane opal is opaque or semi-opaque, but it becomes transparent when placed in water. The term 'hydrophane' literally means 'water-loving.'
I once placed an Ethiopian opal in water myself to test it before selling. Within seconds of immersion, it became almost glass-like. The 'fire', the play of color, became clearly visible, whereas it hadn't been apparent before.
I was genuinely shocked when I saw this for the first time. Since then, I've made it a rule: I test any hydrophane stock myself first. After all, a customer will only return if they trust the product.
Ethiopian opal is mostly of the hydrophane variety. Mexican water opal, on the other hand, is naturally transparent.
Why does Ethiopian opal absorb water?
Ethiopian opal forms in volcanic rock, specifically rhyolite, a fine-grained volcanic rock. This differs from Australian opal, which forms in sedimentary sandstone.
The volcanic formation process results in a highly porous internal structure. Think of the difference between a sponge and a stone: both can be beautiful, but one absorbs water while the other does not.
Ethiopian opal contains microscopic pores too small to be seen, yet large enough to absorb water molecules. When the stone comes into contact with water, moisture enters these pores and temporarily fills the voids between the silica spheres that create the opal's characteristic play-of-color.
When water replaces air in these voids, light travels differently through the stone, resulting in increased transparency and enhanced play-of-color qualities that make wet Ethiopian opal incredibly attractive.
As the water dries, the stone returns to its normal state. This process is completely reversible. It can occur thousands of times without causing any damage to the stone.
The Play of Color in Water Opal—What Makes It Magical?
The 'play of color' in opals refers to how these stones shift and display different shades. This effect is not the result of any coating or treatment; rather, it stems from the stone's internal structure. Silica spheres within the opal diffract light, scattering it into a spectrum of colors.
This play of color is displayed spectacularly in water opals, which have a clear, transparent structure. While 'fire' (vibrant flashes of color) can also be seen in opals with darker backgrounds, the transparency of water opal lends it a unique depth, creating the illusion that the stone is glowing from within.
The key features of water opal include
Spectral Fire: The visible colors include blue, green, violet, red, and orange, often appearing simultaneously.
Color Shift: The colors change as the viewing angle shifts.
Luminescence: The play of color appears even more brilliant and vivid in bright light.
Excellent Cut: The play of color is displayed most clearly and attractively in a 'cabochon cut.'
The combination of these qualities enhances the captivating beauty of water opal.
What Happens When Opal Gets Wet?
This is the first question most buyers ask. And the correct answer is: it depends on the type of opal.
Australian Opal and Water
Nothing significant happens. Australian opal does not absorb water. Brief contact with water, such as washing your hands while wearing a ring or getting caught in the rain, poses no problem. While prolonged submersion is not recommended as it could affect some stones, occasional contact with water causes no harm.
Ethiopian Opal and Water
This is where it gets interesting. When Ethiopian "water opal" gets wet:
The stone becomes more transparent. Its milky or white base clears up significantly.
The play-of-color appears clearer and sometimes more vibrant; as water fills the stone's microscopic pores, light penetrates deeper into the gem.
The stone's appearance may change dramatically. A gem that looked pale or milky when dry might suddenly display brilliant blue, green, or orange hues when wet.
Over time, usually ranging from 30 minutes to a few hours, depending on the amount of water absorbed, the stone dries out and returns to its original dry state. This is not damaged. It is simply a unique characteristic of Ethiopian opal.
Ethiopian Water Opal vs. Mexican Water Opal
Both are popular and beautiful, but it is important for a buyer to know the differences.
Mexican Water Opal
It is more stable, water does not harm it.
It is naturally transparent, so there is no need to keep it in water.
Its price ranges from $5 to $80 per carat, depending on its 'Fire' activity.
Its colors are typically light (pastel), displaying a sheen or 'fire' of pale blue, green, and yellow.
Ethiopian Water Opal / Hydrophane
If it is not dried properly, it may sometimes crack.
It features intense colors and fiery red and orange fire.
Prices range from $3 to $150+ per carat for top quality.
Ethiopian water opal absorbs water and becomes transparent for a short time.
A customer once asked me, "Can I keep this stone in an aquarium permanently?" He thought it might look better if kept in water. I explained that it is not advisable to keep hydrophane opal in water permanently. The stone's pores open up, allowing foreign substances to enter. A brief dip is fine, but permanent storage is not.
Does Getting Wet Damage Ethiopian Water Opal?
A short period of time in water does not harm Ethiopian opal. The hydrophane process is both reversible and natural. However, there are some important things to keep in mind, as these can cause problems over time:
Excessive Soaking
If Ethiopian opal is left in water for long periods—hours or days—repeated soaking and drying can stress the stone. This stress will not occur immediately but can accumulate over repeated exposure to water.
Soap and Chemicals
Substances like soap, detergent, perfume, and cleaning products can penetrate the stone's pores, leaving marks that can permanently alter its appearance. Repairing such damage is often more difficult than avoiding prolonged soaking.
Rapid Temperature Changes
Extreme changes in temperature, such as going from cold water to hot water or vice versa, can put stress on any gemstone. To protect your Ethiopian opal, it's best to remove it before taking a hot shower or moving from cold outdoor temperatures to a warm environment.
Ultrasonic Cleaners
Never put your Ethiopian opal in an ultrasonic cleaner. The vibrations from these devices can cause crazing, which are tiny cracks inside that can permanently damage the stone.
Simple Guidelines
To protect your Ethiopian opal, always remove it before washing dishes, bathing, swimming, or using cleaning products. If it accidentally gets wet, it's usually not a big deal. Dry the stone gently and let it air dry completely before storing.
How long does it take for Ethiopian opal to dry?
Drying time depends on the amount of water the opal was soaked in and the surrounding moisture. If the stone was soaked for a few seconds, it may take about 15 to 30 minutes to dry completely. If it was soaked for a few minutes longer, it may take several hours to dry completely.
In very humid areas, the opal may take up to 24 hours to dry completely. You'll know the stone is completely dry when it returns to its original state. A milky or white base should reappear, and the stone should look the same as it did before getting wet.
Avoid using heat to speed up the drying process. Don't use a hair dryer, expose it to direct sunlight, or expose it to any heat source. Instead, let the opal air dry naturally in a cool, shady place.
Opal and Water—A Collector's Perspective
Here's a point that many guides often overlook: Experienced opal collectors and dealers often use the hydrophane properties of Ethiopian opal as a quality assessment tool.
When you wet an Ethiopian opal and see a significant improvement in its color, making it appear brighter, more transparent, and more vibrant, it indicates that the underlying silica structure is intact and of good quality.
If a stone doesn't change much when wet or appears the same both dry and wet, it may have lower potential than a stone with clear hydrophane behavior.
The wet appearance of a good-quality Ethiopian opal indicates how the stone will appear as a crystal opal. It should be completely transparent and glow like fire from within, not just on the surface.
That's why some buyers specifically look out Ethiopian water opal; Hydrophane behavior is no exception. For many collectors, it is one of the qualities that makes the stone attractive.
Ethiopian Water Opal vs Australian Opal — Key Differences
Feature
Ethiopian Water Opal
Australian Opal
Hydrophane
✅ Yes — absorbs water
❌ No — water stable
Formation
Volcanic rock
Sedimentary rock
Body Tone
White, crystal, brown
Black, white, crystal, boulder
Color Play
Often vivid and saturated
Deep, layered, pattern-defined
Price
More affordable
Significantly more expensive
Water Contact
Remove before soaking
Generally more tolerant
Availability
Widely available
Limited supply
Best For
Jewelry, collecting, value
Investment, daily wear rings
Most people go for Australian black opal or boulder opal because they're popular. But the color play of a good quality Mexican water opal or Ethiopian hydrophane opal is truly unmatched. Australian opal is more durable for daily wear, especially in rings. Ethiopian water opal has the color fire of a lotus and is quite affordable—same fire, almost one-third the price.
Can Green Opal Go in Water?
Green opal is mostly common opal. This means it doesn't have any play of color. It's safe to put in water, but hydrophane is also a variety of green opal. If your green opal is of Ethiopian origin and shows transparency, it may be hydrophane, so some care is needed.
General rule: If the stone feels porous, has a matte surface, or changes color clearly when placed in water—treat it like a hydrophane.
How are opals formed? (Simple Version)
Opals form in nature over millions of years. When rainwater seeps into the ground, it carries silica. This silica settles in cracks and cavities. The water evaporates, leaving behind the silica. This process repeats over and over again.
Round silica particles settle in a pattern. When these particles are the right size and in the right pattern, light diffracts and creates color. In Australian opal, this process takes up to 50 million years. Ethiopian Welo opal is much younger, about 3 million years.
The silica in water opal is so pure and the structure so open that its body is almost colorless, making it appear transparent.
What Makes a Good Ethiopian Water Opal
If you're buying Ethiopian opal specifically for its hydrophane qualities, keep these things in mind:
Deep Color Play When Dry
A stone with good dry color play will have even better color play when wet. If the stone looks dull and lifeless when dry, wetting it won't make it anything spectacular.
Crystal or Semi-Transparent Body Tone
The more transparent the body, the more dramatic the hydrophane effect. A highly crystalline Ethiopian opal that appears almost clear when wet is one of the most beautiful gemstones in the world.
Natural and Untreated
Some Ethiopian opal is smoke-treated to deepen its body tone. Smoke treatment can affect how the stone responds to water. Always ask about the treatment status before purchasing.
Verified Welo Origin
Ethiopian opal from the Welo area of Wollo Province is the standard for high-quality hydrophane opal. Ask your supplier for provenance information.
Final Thoughts
Water opal is underrated. This is my genuine opinion. People mostly go after Australian black opal or boulder opal because they're more popular. But the color play of a good quality Mexican water opal or Ethiopian hydrophane opal is honestly second to none. And yes, if someone tells you it's a 'magical stone' that needs to be permanently submerged in water, they're either mistaken or overselling. The stone is definitely beautiful.
Buy Ethiopian Water Opal at Armonia Gems
We supply natural Ethiopian Welo Opal—raw, rough lots, and polished cabochons—that are accurately described. All stones we sell are natural and untreated, unless specifically stated. We provide natural-light photos and videos so you can see the true stone—not a studio-enhanced version.
Visit Ethiopian Water Opal to view our current Ethiopian Opal collection. Questions about hydrophane behavior, care, or specific stones—email support@armoniagems.com or WhatsApp +91 96946 66667.
Frequently Asked Questions (FAQ)
Q1: Do water opals have to stay in water?
Ans: No, this is a myth. It is not necessary for water opal to remain in water. It remains perfectly fine even in dry environment. Bas protect from direct sunlight and extreme heat.
Q2: What is the difference between Ethiopian opal and Australian opal?
Ans: Ethiopian opal is hydrophane — it absorbs water and temporarily changes appearance. Australian opal is not hydrophane. It is more stable and better suited for daily wear rings. Ethiopian opal is generally more affordable with often more vivid color play. Australian opal commands higher prices due to its long mining history and superior durability.
Q3: Can I wear Ethiopian opal in the shower?
Ans: No, remove Ethiopian opal jewelry before showering. The soap and prolonged water contact can penetrate the stone's pores and leave residue that permanently affects its appearance. Brief accidental contact is not a disaster — dry the stone gently and let it air out completely.
Q4: Can Opals Get Wet
Ans: Australian opal: Brief water contact is fine. Prolonged soaking not recommended. No dramatic change in appearance. Ethiopian water opal: Brief contact is fine. The stone will temporarily change appearance — becoming more transparent, possibly more colorful. It returns to normal when dry. Avoid prolonged soaking, soap, and chemicals. Opal doublets and triplets: Keep away from water. The layers can delaminate — separate — when water gets between them. This is permanent damage.
Q5: How to Care for Your Ethiopian Water Opal
Ans: Do: • Wipe with a soft dry cloth after accidental water contact • Store in a cool, dry place — not sealed airtight • Clean with a barely damp cloth if needed — no soap. • Let it air dry completely before storing after any water contact • Enjoy the hydrophane effect occasionally — it will not damage the stone. Don't: • Soak in water • Use soap, perfume, or cleaning products near the stone • Put in an ultrasonic cleaner • Use heat to dry it • Store in a very humid environment for extended periods