Lyla Lindsey
Opal is a gemstone that is famous for its play of colours, a unique optical effect that results in flashes of coloured light. Opals are multi-coloured and consist of small spheres of silica arranged in a regular pattern, with water between the spheres. The spheres diffract white light, breaking it up into the colours of the spectrum. Opals are found all over the world, but Australia produces 95% of the world's precious opal and it is the country's national gemstone. Australian opals come in a diverse range of forms, each with unique characteristics that affect their appearance, value, and rarity.
| Characteristics | Values |
|---|---|
| Body tone | Deep blacks to soft, milky whites |
| Brightness | Valued more highly if it looks bright and beautiful from all directions |
| Rarity | The rarer the combination of features, the more highly valued |
| Colour | Multi-coloured, displaying a rainbow-like array of colours |
| Imperfections | Sand or potch on the face of the opal can decrease value |
| Country of origin | Australia is the world's leading source of opal |
| Region of origin | Queensland, New South Wales, South Australia |
| Specific locations | Coober Pedy, Lightning Ridge, Andamooka, White Cliffs, Kynuna, Quilpie, Jundah, Yowah, Koroit, Eulo, Cunnamulla |
| Patterns | Harlequin, pinfire, Chinese writing, flower garden, mackerel sky, flagstone, rolling flash, flame, mosaic, ribbon |
| Types | Precious opal, common opal, boulder opal, crystal opal, black opal, white opal, matrix opal, wood opal |
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What You'll Learn
- Opals are multi-coloured and display a rainbow-like effect due to their intrinsic microstructure
- Australia produces 95% of the world's precious opal and it is the country's national gemstone
- Black opal is the rarest and most valuable type of opal in the world, found almost exclusively in Lightning Ridge, Australia
- Boulder opal is found in central Queensland and is known for its unique character
- Opal is a hardened gel of silica and water, with a water content of usually 6-10%
Opals are multi-coloured and display a rainbow-like effect due to their intrinsic microstructure
Opals are unique gemstones that display a rainbow-like effect due to their intrinsic microstructure. This effect, known as opalescence, is caused by the diffraction of white light into all the colours of the spectrum. Opals are composed of small spheres of silica arranged in a regular, three-dimensional grid, with water between the spheres. The spheres act as a diffraction grating, breaking up the light into its spectral colours. The size of the spheres determines the colours produced, with larger spheres providing the full range of colours and smaller spheres producing only blues and greens. This play of colour, or iridescence, is a defining characteristic of precious opal, which is the type of opal typically referred to and used in jewellery.
The body tone of an opal, which ranges from deep blacks to soft, milky whites, also plays a significant role in determining its value. Black opal, with its dark body tone, is considered the rarest and most valuable type of opal. It is found almost exclusively in Lightning Ridge, Australia, and its dark background amplifies the brilliance of its play of colour. White opal, on the other hand, is more commonly found and was first discovered in Coober Pedy, South Australia, in 1915.
Boulder opal is another distinctive type of Australian opal, formed within ironstone boulders in Queensland. The thin veins of opal fill the natural cracks and cavities in the host rock, resulting in undulating surfaces and unique patterns. Boulder opals are known for their vibrant colours and intricate designs, sometimes even revealing picture-like scenes within the opal face.
The rarity and beauty of Australian opals have made them highly valued worldwide. Opal artefacts dating back thousands of years have been discovered, indicating the long-standing appreciation for this gemstone. In modern times, opal mining has played a significant role in providing economic opportunities for indigenous communities in Australia.
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Australia produces 95% of the world's precious opal and it is the country's national gemstone
Opal is a gemstone famed for its unique play of colours, which creates a rainbow-like display. This play of colour is determined by the opal's body tone, which can range from deep blacks to soft, milky whites, and its brightness. The more attractive the pattern, the more valuable the opal. For example, black opal is considered the rarest and most valuable type of opal in the world, found almost exclusively in Lightning Ridge, Australia.
Australia is the world's leading source of opal, producing 95% of the world's precious opal. Opal was declared Australia's national gemstone in 1994. Opal mining in Australia has a long history, with opal artefacts several thousand years old having been discovered in East Africa, and Aboriginal Dreamtime stories featuring opal. Commercial opal mining began in Australia in 1875 at Listowel Downs in Queensland. In 1915, a 14-year-old boy found an opal at a camp outside of Adelaide, sparking an 'opal rush'.
Today, opal mining in Australia continues to be a significant industry, with centres in South Australia, including Coober Pedy, Andamooka, and Mintabe, and New South Wales, including Lightning Ridge and White Cliffs. Queensland is also a major producer of opal, with the boulder opal found exclusively in the state. The unique combination of geological conditions in Australia, particularly in the harsh outback, has allowed for the formation of opal near the margins of an ancient inland sea.
The Australian opal industry is also known for its innovative use of technology in mining and cutting practices. For example, Australian opal cutters have developed techniques to create enhanced opals, such as doublets and triplets, which are composed of different layers of opal and stone, making them more affordable than solid opals. Overall, Australia's rich opal resources and long history of opal mining have solidified its position as the world's leading source of this precious gemstone.
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Black opal is the rarest and most valuable type of opal in the world, found almost exclusively in Lightning Ridge, Australia
Opals are unique gemstones that display a rainbow-like array of colours due to their intrinsic microstructure, which diffracts white light into all the colours of the spectrum. The body tone and brightness of an opal play a significant role in determining its value. Black opal, with its dark body tone, is the rarest and most valuable type of opal in the world.
Black opal is characterised by its dark body tone, rated N1 to N4 on the body tone scale. This dark tone creates a striking contrast and enhances the brilliance of its play of colour. Occasionally, a black opal may appear dark without any potch, and instead has a naturally tinted body tone, similar to smoky glass, while still allowing some light to pass through. These are known as black crystal opals and are considered exceptionally rare and highly prized.
Australia is the largest producer of opal in the world, and it is their official national gemstone. Opal mining in Australia has a long history, with Aboriginal people being the first finders of opal, as evidenced by Dreamtime stories that talk about the creation of opal. In modern times, opal mining has provided Aboriginal people with economic opportunities during a time when that was challenging elsewhere.
Lightning Ridge in New South Wales, Australia, is almost the exclusive source of black opal. This region is renowned for its opal mining, with companies like Down to Earth Opals specialising in mining and designing jewellery with black opal sourced from Lightning Ridge. The unique combination of geological conditions in this region has made it the primary source of this rare and valuable gemstone.
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Boulder opal is found in central Queensland and is known for its unique character
Opals are unique gemstones that display a rainbow-like array of colours due to their intrinsic microstructure, which refracts white light into all the colours of the spectrum. They are multi-coloured and consist of small spheres of silica arranged in a regular pattern, with water between the spheres. Opals are found in several countries, including Brazil, Mexico, Ethiopia, the United States, Canada, Peru, Indonesia, Honduras, Slovakia, the Czech Republic, and Australia, which produces 95% of the world's precious opal.
Boulder opal is a distinctive type of Australian opal, found exclusively in central Queensland. It is commonly found at the centre of ironstone concretions, with the opal part spread out through cracks in its host rock or attached to the surface as a thin layer. Boulder opals are cut with the natural host rock, ironstone, on the back, giving them a wide variety of shapes. They are known for their unique character, with vibrant colours and striking, intricate patterns. Some even reveal picture-like scenes within the opal face. The town of Quilpie in central Queensland is the largest producer of boulder opal.
The appearance of an opal is a significant factor in determining its value. Opals that look bright and beautiful from all directions are considered more valuable than those that only look good when held in one position. The body tone and brightness of an opal also play a crucial role in its value determination. Black opal, for example, is the rarest and most valuable type of opal in the world due to its dark body tone, which amplifies the brilliance of its play of colour.
The rarity of the combination of features in a precious opal also influences its value. Opal is considered a precious gemstone and is often used in jewellery. It was declared Australia's National Gemstone in 1994.
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Opal is a hardened gel of silica and water, with a water content of usually 6-10%
Opal is a unique gemstone, famous for its ever-changing play of colours. It is a hydrated amorphous form of silica (SiO2·nH2O) and is, in simple terms, a hardened gel of silica and water. The water content of opal may range from 3% to 21% by weight, but it is usually between 6% and 10%.
Opal is Australia's national gemstone, and the country produces 95% of the world's precious opal. The Aboriginal people were the first to discover opal in Australia, and there are Dreamtime stories that talk about the creation of opal. Opal mining in Australia has a significant history, with the country taking over as the major producer of opals in the world in 1932.
The appearance of opal is determined by its body tone and brightness, with darker opals providing a stronger contrast to brilliant colours and being more valuable. Opals display a rainbow-like array of colours due to their intrinsic microstructure, which diffracts white light into all the colours of the spectrum. The internal structure of precious opal, with its silica spheres, causes this diffractive property, resulting in a play of colours.
Boulder opal is one of the most distinctive types of Australian opal, found exclusively in Queensland. Boulder opals are formed within ironstone boulders, with thin veins of opal filling natural cracks and cavities in the host rock. The process of opal filling these microscopic cracks and crevices is considered "miraculous". To reveal the colour, the ironstone must be carefully hand-carved by a master gem cutter, a challenging and time-consuming task.
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Frequently asked questions
Opal is a gemstone that is a hardened gel of silica and water. It is unique because it displays a rainbow-like display due to its intrinsic microstructure, which diffracts white light into all the colours of the spectrum.
Australian opal comes in a diverse range of forms, each with unique characteristics. It can be white, black, or crystal. White opal is the most common, while black opal is considered the rarest and most valuable. Crystal opal is translucent, allowing some light to pass through and creating a luminous, layered effect.
The different types of Australian opal include boulder opal, which is found exclusively in Queensland, and black opal, which is sourced almost exclusively from Lightning Ridge in New South Wales. Matrix opal and crystal opal are also found in South Australia.
The appearance of Australian opal is influenced by its body tone and brightness, with darker opals providing stronger contrast and amplifying the brilliance of their play of colour. The rarity of the combination of features in an opal also affects its value.
