Exhibiting very bright colour flashes, an opal with honeycomb pattern at the front and mosaic at the back. This skewed hexagonal gem is an example of beauty that can come out of Ethiopian opal mines. It is cut from a rare material indeed, not only does it exhibit sought after honeycomb pattern but it also has a pleasant, light brown base that accentuates its play of colour. This cab is slightly domed on both sides, so you have a choice of how you want to use it, either side will present well. Maybe a double-sided design to show them both? Its play of colour works like a rolling broad flash, with fire moving in colour waves, shining through a tiny honeycomb windows. This would be a nice stone to have in your personal collection as an example of Ethiopian Honeycomb and Digit patterns. Digit pattern being essentially a honeycomb but viewed from the side. To retain this rare material we allowed two small faults to remain. Visible in the second picture, on lower left edge, there’s a groove with small crack that was originally present in the rough stone. It doesn’t run across the whole thickness of this gem and I could cut it out completely but the stone would loose quite a lot to keep it symmetrical. The second fault is even more insignificant and is located at the opposite side. Both faults are barely visible with the naked eye and are located at the sides. They would be covered during the setting of this opal.
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It all happens deep within the earth, when the hot water with a lot of silica dissolved in it, begins to cool. As its temperature drops, it cannot hold the silica anymore and starts to deposit it. If the conditions are right, that silica will then settle in the form of microscopic spheres. Hopefully uniform in size and arrangement across a small patch. When a lot of those patches, made of different sized silica spheres, solidify into one mass. The precious opal is born.
The size of those silica spheres and the gaps between them is what decides what colour you will ultimately see, coming out of any given patch within the opal. When the lights passes through, larger gaps allow longer light wavelengths to be reflected towards the viewer, while smaller gaps will result in shorter wavelengths. The shortest wavelength we can see is violet and the longest one is red. It is no wonder then, that red is the rarest colour in most of opals, as it requires larger spheres to be formed. As always, there are exceptions and in this case, it seems that red is far more common in Ethiopian opals than it is in Australian ones.
Basic division is between precious and common, with the latter not possessing any play of colour. Moving past that, into the precious opal category, we divide opal by its body tone. It can vary from completely black, through all shades of grey, into white. There are also transparent stones, called crystal opals. In general the darker the body tone the higher the price premium. It is because a darker body tone provides a better contrast for the play of colour to shine against. Also because almost all black opal comes for a single source- Lightning Ridge, Australia. A quality crystal opal can circumvent those rules, especially when it shows multiple layers of fire, creating a mesmerising 3-D colour show.
Following that, it is important what colours are present and what kind of pattern do they form. There’s a whole nomenclature of pattern names used in opal trade but in the end, you simply must see the stone. Opal is just too diverse to rely on a description alone. Usually the larger and more geometrically uniform the patterns are, the more desired the gem is. Equally important is the total amount of play of colour and the intensity of it. The origin is also an important factor for the price. There are many opal sources in the world, starting with the leader- Australia. It provides over 90% of total yearly supply at the moment. Other sources include Mexico, Brazil and a recent newcomer- Ethiopia.
Opals hardness varies between 5 and 6.5 on a Mohs Scale. While wearing opal you should generally avoid impacts, abrasion and immersion in liquids other than water ( household chemicals, oils, etc.). To clean your opal, it’s best to use a wet cloth or gently clean it under the running water. You should avoid ultrasonic cleaners.
Most of them are connected to the hydrophane property of these gems. When exposed to water, Ethiopian Welo opals absorb it in a relatively short time. In most cases, it causes their body colour to become transparent and may affect the play of colour as well. Some Ethiopian stones will have their fire strengthened but most will loose it. This effect is temporary and they will regain their original appearance as they dry. This can take as short as an hour or as long as a couple of days, depending on the atmospheric conditions and the size of the opal. You should keep them away from liquids in general. Oils, juices and other coloured liquids may stain your opal and it will usually be impossible to return it to the original state.
While considering a purchase, please also note that many Ethiopian Welo opals have their fire strongest while under incandescent light or in direct sunlight and may not be as lively on an overcast winter day. Again, this is not something that affects all of them. Don’t hesitate to ask about any stone in our store.