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Sewelô
The Sewelô diamond is the third-largest rough diamond ever found. The diamond was recovered in April 2019 by the Lucara Diamond Corp in its Karowe diamond mine in Botswana. The diamond is 1,758 carats and weighs 352 grams or 12.39 oz. At the time it was found, ''Sewelô'' was the largest diamond in Botswana's history, surpassing the 1,111 carats (222 g, 7.83 oz.) Lesedi La Rona extracted at the same mine on 16 November 2015. The Lesedi La Rona was the fourth-largest diamond ever found, and the third-largest of gem quality. The gem was named through a competition held by Lucara. Out of 22,000 submissions the name ''Sewelô'' was chosen, which translates 'rare find' in Setswana. In January 2020 it was announced that Louis Vuitton had purchased the diamond for an undisclosed sum. Louis Vuitton will work with HB Antwerp to polish the diamond and cut it into smaller stones. The stone is covered with a thin layer of opaque black carbon and its surface is pitted. It is the size ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2019 In Botswana
Botswana held a general election in October 2019. Though it was more competitive than previous elections, it resulted in a victory for the ruling Botswana Democratic Party (BDP) and won an addition term for President Mokgweetsi Masisi. Botswana saw an escalation in the rivalry between Masisi and his predecessor Ian Khama, with Khama leaving the Botswana Democratic Party to support the Botswana Patriotic Front and the Umbrella for Democratic Change. Following the BDP's victory, opposition leaders challenged the results of the election. The Sewelô diamond was discovered in April 2019, and two other diamonds, the Okavango Blue and the Lesedi La Rona, were unveiled in the same month. The nation's ban on elephant hunting was controversially lifted in May 2019. Botswana's law criminalising homosexuality was overturned by the High Court of Botswana in June 2019, prompting a challenge from the government. Incumbents * President: Mokgweetsi Masisi * Vice President: Slumber Tsogwane * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HB Antwerp
HB Antwerp is a diamond cutting and technology company based in Antwerp, Belgium. It was founded in 2020 by Shai de Toledo, Rafael Papismedov, and Oded Mansori. History HB Antwerp purchases rough diamonds from the Karowe mine in Botswana through a deal with Canadian mining company Lucara Diamond Corporation and works in partnership with the Botswana government. In 2020, HB Antwerp partnered with Lucara and Louis Vuitton to work on several large stones, including the " Sewelo" diamond, the "Sethunya", a 549-carat diamond, and a 1,175-carat rough diamond, all discovered in the Karowe mine in Botswana. In August 2020, they entered an agreement to purchase all of Lucara’s large stones (10.8 carats and up) and, in 2022, they signed a ten-year contract. The contract was terminated in October 2023. In 2022, the company partnered with Microsoft to verify and track mined gems; all data about their trajectory is stored on a blockchain. Later that year it partnered with engineering c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louis Vuitton
Louis Vuitton Malletier, commonly known as Louis Vuitton (, ), is a French high-end Luxury goods, luxury fashion house and company founded in 1854 by Louis Vuitton (designer), Louis Vuitton. The label's LV monogram appears on most of its products, ranging from luxury bags and leather goods to ready-to-wear, shoes, watches, jewelry, accessories, sunglasses and books. Louis Vuitton is one of the world's leading international fashion houses. It sells its products through standalone boutiques, lease departments in high-end department stores, departmental stores, and through the e-commerce section of its website. For six consecutive years (2006–2012), Louis Vuitton was named the world's most valuable luxury brand. Its 2012 valuation was US$25.9 billion. In 2013, the valuation of the brand was US$28.4 billion with revenue of US$9.4 billion. The company operates in 50 countries with more than 460 stores worldwide. History Founding to World War II The Louis Vuitton label was founde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Largest Rough Diamonds
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). The list is not intended to be complete – e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced. De Beers generally does not publish information relating to large diamond discoveries. See also *List of diamonds * List of emeralds by size *List of individual gemstones *List of gold nuggets by size * List of sapphires by size References External links * {{List of precious stones by size * Largest rough diamonds diamonds Diamonds Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, bu ... Diamonds, rough ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Carbon
Chemically, black carbon (BC) is a component of fine particulate matter (PM ≤ 2.5 µm in aerodynamic diameter). Black carbon consists of pure carbon in several linked forms. It is formed through the incomplete combustion of fossil fuels, biofuel, and biomass, and is one of the main types of particle in both anthropogenic and naturally occurring soot. Black carbon causes human morbidity and premature mortality. Because of these human health impacts, many countries have worked to reduce their emissions, making it an easy pollutant to abate in anthropogenic sources. In climatology, black carbon is a climate forcing agent contributing to global warming. Black carbon warms the Earth by absorbing sunlight and heating the atmosphere and by reducing albedo when deposited on snow and ice (direct effects) and indirectly by interaction with clouds, with the total forcing of 1.1 W/m2. Black carbon stays in the atmosphere for only several days to weeks, whereas potent greenhouse ga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Mines In Botswana
This list of mines in Botswana is subsidiary to the list of mines article and lists working, defunct and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marble and other quarry, quarries may be included in this list. Diamond *Damtshaa diamond mine *Jwaneng diamond mine *Letlhakane diamond mine *Lerala diamond mine *Karowe diamond mine *Orapa diamond mine Copper-nickel BCl copper-nickel mine, Selibe Phikwe This mine is now closed Gold Francistown Golden Eagle Mine Mopane Mine Nickel *Phoenix nickel mine *Selkirk mine Coal *Letlhakane coal mine *Mea coal mine *Mmamabula *Morupule Colliery *Sese coal mine Uranium *Letlhakane mine References {{reflist Lists of mines by country, Botswana Mines in Botswana, Botswana-related lists, Mines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Diamond Mines
There are a limited number of commercially available diamond mines currently operating in the world, with the 50 largest mines accounting for approximately 90% of global supply. Diamonds are also mined alluvially over disperse areas, where diamonds have been eroded out of the ground, deposited, and concentrated by water or weather action. There is also at least one example of a heritage diamond mine (Crater of Diamonds State Park). Africa Angola *Catoca diamond mine * Fucauma diamond mine * Luarica diamond mine Botswana *Damtshaa diamond mine *Jwaneng diamond mine *Letlhakane diamond mine *Orapa diamond mine * Karowe diamond mine *Lerala diamond mine South Africa *Baken diamond mine *Cullinan diamond mine (previously "Premier mine") *Finsch diamond mine *Kimberley, Northern Cape *Koffiefontein mine *Venetia diamond mine Others *Baba Diamond Fields, Zimbabwe *Marange diamond fields, Zimbabwe *Murowa diamond mine, Zimbabwe *Williamson diamond mine, Tanzania *Letseng diamo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Diamonds
Diamond (gemstone), Diamonds become famous typically for some combination of their size, color and quality. Diamonds occur naturally in many different colors, so the largest diamond of a particular color may not be large in absolute terms, but it may still be considered very desirable. Diamonds may also have high valuations or sale prices, or go on to have a noteworthy ownership history, but this will tend to occur for diamonds that had some outstanding characteristic to begin with. As new diamonds are discovered, the uniqueness of existing ones may diminish and there is no agreed-upon measure of a large or a high-quality diamond, so a strict inclusion criteria for notable diamonds is not attainable. Diamond A diamond is a Allotropes of carbon, solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. At Standard conditions for temperature and pressure, room temperature and pressure, another solid form of carbon known as graphite is the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kimberlite
Kimberlite is an igneous rock and a rare variant of peridotite. It is most commonly known to be the main host matrix for diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an diamond called the Star of South Africa in 1869 spawned a diamond rush and the digging of the open-pit mine called the Big Hole. Previously, the term kimberlite has been applied to olivine lamproites as Kimberlite II, however this has been in error. Kimberlite occurs in the Earth's crust in vertical structures known as kimberlite pipes, as well as igneous dykes. Kimberlite also occurs as horizontal sills. Kimberlite pipes are the most important source of mined diamonds today. The consensus on kimberlites is that they are formed deep within the mantle. Formation occurs at depths between , potentially from anomalously enriched exotic mantle compositions, and they are erupted rapidly and violently, often with considerable carbon dioxide and other volatile componen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Artificial Intelligence
Artificial intelligence (AI) is intelligence—perceiving, synthesizing, and inferring information—demonstrated by machines, as opposed to intelligence displayed by animals and humans. Example tasks in which this is done include speech recognition, computer vision, translation between (natural) languages, as well as other mappings of inputs. The ''Oxford English Dictionary'' of Oxford University Press defines artificial intelligence as: the theory and development of computer systems able to perform tasks that normally require human intelligence, such as visual perception, speech recognition, decision-making, and translation between languages. AI applications include advanced web search engines (e.g., Google), recommendation systems (used by YouTube, Amazon and Netflix), understanding human speech (such as Siri and Alexa), self-driving cars (e.g., Tesla), automated decision-making and competing at the highest level in strategic game systems (such as chess and Go). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tennis Ball
A tennis ball is a ball designed for the sport of tennis. Tennis balls are fluorescent yellow in organised competitions, but in recreational play can be virtually any color. Tennis balls are covered in a fibrous felt which modifies their aerodynamic properties, and each has a white curvilinear oval covering it. Specifications Modern tennis balls must conform to certain criteria for size, weight, deformation, and bounce criteria to be approved for regulation play. The International Tennis Federation (ITF) defines the official diameter as . Balls must have masses in the range . Yellow and white are the only colors approved by the ITF, and most balls produced are a fluorescent yellow known as "optic yellow", first introduced in 1972 following research demonstrating they were more visible on television. Tennis balls are filled with air and are surfaced by a uniform felt-covered rubber compound. The felt delays flow separation in the boundary layer which reduces aerodynamic drag an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diamond
Diamond is a Allotropes of carbon, solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the Chemical stability, chemically stable form of carbon at Standard conditions for temperature and pressure, room temperature and pressure, but diamond is metastable and converts to it at a negligible rate under those conditions. Diamond has the highest Scratch hardness, hardness and thermal conductivity of any natural material, properties that are used in major industrial applications such as cutting and polishing tools. They are also the reason that diamond anvil cells can subject materials to pressures found deep in the Earth. Because the arrangement of atoms in diamond is extremely rigid, few types of impurity can contaminate it (two exceptions are boron and nitrogen). Small numbers of lattice defect, defects or impurities (about one per million of lattice atoms) color diamond blue (bor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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