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The Enigma (diamond)
The Enigma is the largest polished black diamond in the world. Containing 55 facets and weighing in at 555.55 carats (111.11 grams), the Enigma was commissioned and inspired by Ran Gorenstein (Belgium) and completed in June 2004 after several years of cutting and faceting. The repetitive use of the number five in the design of the gem is intentional deriving from the hamsa, a palm-shaped amulet popular among Muslims and Jews in the Middle East and North Africa. The Enigma is a semi-transparent carbonado with a dark brown color. These are typically referred to as black diamonds and are often reserved for industrial uses with larger specimens considered as collectors’ stones, and in fact most gem-quality stones used in contemporary jewelry design have been treated to produce the black color. A natural black diamond of this size is an extremely rare occurrence. The origin of the diamond is uncertain, but it is believed to either be the result of a meteoric impact or part of an as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diamond Cut
A diamond cut is a style or design guide used when shaping a diamond for polishing such as the brilliant cut. Cut does not refer to shape (pear, oval), but the symmetry, proportioning and polish of a diamond. The cut of a diamond greatly affects a diamond's brilliance; this means if it is cut poorly, it will be less luminous. In order to best use a diamond gemstone's material properties, a number of different diamond cuts have been developed. A diamond cut constitutes a more or less symmetrical arrangement of facets, which together modify the shape and appearance of a diamond crystal. Diamond cutters must consider several factors, such as the shape and size of the crystal, when choosing a cut. The practical history of diamond cuts can be traced back to the Middle Ages, while their theoretical basis was not developed until the turn of the 20th century. Design, creation and innovation continue to the present day: new technology—notably laser cutting and computer-aided design— ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carbonado
Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond. It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon, with minor crystalline precipitates filling pores and occasional reduced metal inclusions. It is found primarily in alluvial deposits where it is most prominent in mid-elevation equatorial regions such as Central African Republic and in Brazil, where the vast majority of carbonado diamondites have been found. Its natural colour is black or dark grey, and it is more porous than other diamonds. Unusual properties Carbonado diamonds are typically pea-sized or larger porous aggregates of many tiny black crystals. The most characteristic carbonados are mined in the Central African Republic and in Brazil, in neither place associated with kimberlite, the source of typical gem diamonds. Lead isotope analyses have been interpreted as documenting crystallization of c ... [...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] |
Carat (mass)
The carat (ct) is a unit of mass equal to or 0.00643 troy oz, and is used for measuring gemstones and pearls. The current definition, sometimes known as the metric carat, was adopted in 1907 at the Fourth General Conference on Weights and Measures, and soon afterwards in many countries around the world. The carat is divisible into 100 ''points'' of 2 mg. Other subdivisions, and slightly different mass values, have been used in the past in different locations. In terms of diamonds, a paragon is a flawless stone of at least 100 carats (20 g). The ANSI X.12 EDI standard abbreviation for the carat is CD. Etymology First attested in English in the mid-15th century, the word ''carat'' comes from Italian ''carato'', which comes from Arabic '' qīrāṭ '' قيراط , in turn borrowed from Greek ''kerátion'' κεράτιον 'carob seed', a diminutive of ''keras'' 'horn'. It was a unit of weight, equal to 1/1728 (1/12) of a pound (see Mina (unit)). History Carob seeds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ran Gorenstein
Ran, RaN and ran may refer to: Arts and entertainment * ''Ran'' (film), a 1985 film directed by Akira Kurosawa * "Ran" (song), a 2013 Japanese song by Luna Sea * '' Ran Online'', a 2004 MMORPG (massively multiplayer online role playing game) *''Ran'', a 1903 Swedish opera on the Nordic myth by Wilhelm Peterson-Berger People * Ran (surname), a Chinese surname * Ran (given name) * Ran Bosilek, Bulgarian children's book author born Gencho Stanchev Negentsov (1886–1958) * RaN, Nissim of Gerona (1320–1376), Rabbi Nissim ben Reuven (RaN, the Hebrew acronym of his name, ר"ן) Fictional or mythological characters * Rán, a goddess of the sea in Norse mythology * Ran (Shugo Chara!), in the manga series ''Shugo Chara!'' * Ran (Urusei Yatsura), in the manga series ''Urusei Yatsura'' * Ran, from the sprite webcomic ''Bob and George'' * Ran Aresu, from ''Inazuma Eleven'' * Ran Kotobuki, in the manga series ''Gals!'' * Ran Kuroki, a character from ''Kamen Rider Fourze'' * Ran Mitake, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hamsa
The ''hamsa'' ( ar, خمسة, khamsa) is a palm-shaped amulet popular throughout North Africa and in the Middle East and commonly used in jewellery and wall hangings.Bernasek et al., 2008p. 12Sonbol, 2005pp. 355–359 Depicting the open right hand, an image recognized and used as a sign of protection in many times throughout history, the ''hamsa'' has been traditionally believed to provide defense against the evil eye. ''Khamsah'' is an Arabic word that means "five", but also refers to images of "the five fingers of the hand".Zenner, 1988p. 284World Institute for Advanced Phenomenological Research and Learning (Belmont, Estados Unidos), 1991p. 219Drazin, 2009p. 268 In Jewish culture, the ''hamsa'' is associated with the number five because of the five fingers depicted on the hand, and because the word ''khamsa'' is cognate to the Hebrew ''ḥamishah'' (חֲמִישָׁה), which also means "five." The ''Hamsa'' has also been known as the Hand of Fatima after the daughter of M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sotheby's
Sotheby's () is a British-founded American multinational corporation with headquarters in New York City. It is one of the world's largest brokers of fine and decorative art, jewellery, and collectibles. It has 80 locations in 40 countries, and maintains a significant presence in the UK. Sotheby's was established on 11 March 1744 in London by Samuel Baker, a bookseller. In 1767 the firm became Baker & Leigh, after George Leigh became a partner, and was renamed to Leigh and Sotheby in 1778 after Baker's death when Leigh's nephew, John Sotheby, inherited Leigh's share. Other former names include: Leigh, Sotheby and Wilkinson; Sotheby, Wilkinson and Hodge (1864–1924); Sotheby and Company (1924–83); Mssrs Sotheby; Sotheby & Wilkinson; Sotheby Mak van Waay; and Sotheby's & Co. The American holding company was initially incorporated in August 1983 in Michigan as Sotheby's Holdings, Inc. In June 2006, it was reincorporated in the State of Delaware and was renamed Sotheby's. In Ju ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard Heart
Richard is a male given name. It originates, via Old French, from Old Frankish and is a compound of the words descending from Proto-Germanic ''*rīk-'' 'ruler, leader, king' and ''*hardu-'' 'strong, brave, hardy', and it therefore means 'strong in rule'. Nicknames include "Richie", "Dick", "Dickon", " Dickie", "Rich", "Rick", "Rico", " Ricky", and more. Richard is a common English, German and French male name. It's also used in many more languages, particularly Germanic, such as Norwegian, Danish, Swedish, Icelandic, and Dutch, as well as other languages including Irish, Scottish, Welsh and Finnish. Richard is cognate with variants of the name in other European languages, such as the Swedish "Rickard", the Catalan "Ricard" and the Italian "Riccardo", among others (see comprehensive variant list below). People named Richard Multiple people with the same name * Richard Andersen (other) * Richard Anderson (other) * Richard Cartwright (other) * R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Securities Exchange Commission
The U.S. Securities and Exchange Commission (SEC) is an independent agency of the United States federal government, created in the aftermath of the Wall Street Crash of 1929. The primary purpose of the SEC is to enforce the law against market manipulation. In addition to the Securities Exchange Act of 1934, which created it, the SEC enforces the Securities Act of 1933, the Trust Indenture Act of 1939, the Investment Company Act of 1940, the Investment Advisers Act of 1940, the Sarbanes–Oxley Act of 2002, and other statutes. The SEC was created by Section 4 of the Securities Exchange Act of 1934 (now codified as and commonly referred to as the Exchange Act or the 1934 Act). Overview The SEC has a three-part mission: to protect investors; maintain fair, orderly, and efficient markets; and facilitate capital formation. To achieve its mandate, the SEC enforces the statutory requirement that public companies and other regulated companies submit quarterly and annual reports ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptocurrency
A cryptocurrency, crypto-currency, or crypto is a digital currency designed to work as a medium of exchange through a computer network that is not reliant on any central authority, such as a government or bank, to uphold or maintain it. It is a decentralized system for verifying that the parties to a transaction have the money they claim to have, eliminating the need for traditional intermediaries, such as banks, when funds are being transferred between two entities. Individual coin ownership records are stored in a digital ledger, which is a computerized database using strong cryptography to secure transaction records, control the creation of additional coins, and verify the transfer of coin ownership. Despite their name, cryptocurrencies are not considered to be currencies in the traditional sense, and while varying treatments have been applied to them, including classification as commodities, securities, and currencies, cryptocurrencies are generally viewed as a distinc ... [...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] |
