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Gemmological Association Of Great Britain
The Gemmological Association of Great Britain (Gem-A) is an international gemmology education and qualifications body based in the United Kingdom. History Gem-A emerged from an ''Education Committee'' set up by ''The National Association of Goldsmiths (NAG)'' in 1908. As the study of gemmology grew in popularity, NAG established the Gemmological Association as an independent branch in October 1931, under the successive presidencies of Henry Miers, William Bragg and Herbert Smith. The organisation was subsequently renamed the ''Gemmological Association of Great Britain'' in 1838, before being incorporated in 1947. The association now trades under the name of ''Gem-A'', following the closure of the organisation's gem testing lab in 2007 (and the organisation's subsequent refocus on research and education). ''The Gemmological Association of Great Britain'' is a registered United Kingdom-based charity and its gemmology and diamond courses are taught in some 25 countries worldwid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gemmology
Gemology or gemmology is the science dealing with natural and artificial gemstone materials. It is a specific interdisciplinary branch of mineralogy. Some jewelers (and many non-jewelers) are academically trained gemologists and are qualified to identify and evaluate gems. History Rudimentary education in gemology for jewellers and gemologists began in the nineteenth century, but the first qualifications were instigated after the National Association of Goldsmiths of Great Britain (NAG) set up as an Education Committee for this purpose in 1908. The committee emerged as a distinct branch of NAG (named the Gemmological Association) in 1931, shortly after the incorporation of the Gemological Institute of America (GIA). In 1938 the branch was renamed as the Gemmological Association of Great Britain, before being incorporated in 1847. The organisation is now an educational charity and accredited awarding body with its courses taught worldwide. The first US graduate of Gem-A's diploma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The UK includes the island of Great Britain, the north-eastern part of the island of Ireland, and most of List of islands of the United Kingdom, the smaller islands within the British Isles, covering . Northern Ireland shares Republic of Ireland–United Kingdom border, a land border with the Republic of Ireland; otherwise, the UK is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. It maintains sovereignty over the British Overseas Territories, which are located across various oceans and seas globally. The UK had an estimated population of over 68.2 million people in 2023. The capital and largest city of both England and the UK is London. The cities o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gemology
Gemology or gemmology is the science dealing with natural and artificial gemstone materials. It is a specific interdisciplinary branch of mineralogy. Some jewellery, jewelers (and many non-jewelers) are academically trained gemologists and are qualified to identify and evaluate gems. History Rudimentary education in gemology for jewellers and gemologists began in the nineteenth century, but the first qualifications were instigated after the National Association of Goldsmiths of Great Britain (NAG) set up as an Education Committee for this purpose in 1908. The committee emerged as a distinct branch of NAG (named the Gemmological Association) in 1931, shortly after the incorporation of the Gemological Institute of America (GIA). In 1938 the branch was renamed as the Gemmological Association of Great Britain, before being incorporated in 1847. The organisation is now an educational charity and accredited awarding body with its courses taught worldwide. The first US graduate of Gem-A' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Miers
Sir Henry Alexander Miers, FRS (25 May 1858 – 10 December 1942) was a British mineralogist and crystallographer. Born in Rio de Janeiro, Brazil, he was educated at Eton College and Trinity College, Oxford. He was elected a Fellow of the Royal Society in 1896. was elected to membership of the Manchester Literary and Philosophical Society on 30 November 1915 and was President of the Society 1919–21. He was Professor of Crystallography at the Victoria University of Manchester 1915–1926 and Vice-Chancellor A vice-chancellor (commonly called a VC) serves as the chief executive of a university in the United Kingdom, New Zealand, Australia, Nepal, India, Bangladesh, Malaysia, Nigeria, Pakistan, Sri Lanka, South Africa, Kenya, other Commonwealth of Nati ... of the University during the same years.Charlton, H. B. (1951) ''Portrait of a University, 1851-1951''. Manchester: University Press; pp. 141, 176 Selected publications *with R. Crosskey: * * * * References Exter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Henry Bragg
Sir William Henry Bragg (2 July 1862 – 12 March 1942) was an English physicist and X-ray crystallographer who uniquelyThis is still a unique accomplishment, because no other parent-child combination has yet shared a Nobel Prize (in any field). In several cases, a parent has won a Nobel Prize, and then years later, the child has won the Nobel Prize for separate research. An example of this is with Marie Curie and her daughter Irène Joliot-Curie, who are the only mother-daughter pair. Several father-son pairs have won two separate Nobel Prizes. shared a Nobel Prize with his son Lawrence Bragg – the 1915 Nobel Prize in Physics: "for their services in the analysis of crystal structure by means of X-rays". Biography Early years Bragg was born at Westward, near Wigton, Cumberland, England, the son of Robert John Bragg, a merchant marine officer and farmer, and his wife Mary née Wood, a clergyman's daughter. When Bragg was seven years old, his mother died, and he was rais ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herbert Smith (mineralogist)
George Frederick Herbert Smith Order of the British Empire, CBE (26 May 1872 20 April 1953) was a British mineralogist who worked for the Natural History Museum, London, British Museum (Natural History). He discovered the mineral paratacamite in 1906, and developed a jeweller's refractometer for the rapid identification of gems. The minerals smithite and herbertsmithite are named after him, as is Herbert's rock-wallaby. Career Smith was born in 1872, went to school at Winchester College and then to New College, Oxford. In Oxford, he studied mathematics from 1891 to 1895, gaining first class marks, and then graduated in physics in 1896. Smith was appointed as an assistant in the British Museum (Natural History) in December 1896. He worked in the mineralogy department of the museum until 1921, when he became assistant secretary of the museum, succeeding Charles E. Fagan. In his mineralogical career, Smith worked on topics including the determination of mineral structures and ... [...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. Diamond is tasteless, odourless, strong, brittle solid, colourless in pure form, a poor conductor of electricity, and insoluble in water. Another solid form of carbon known as graphite is the Chemical stability, chemically stable form of carbon at Standard 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. 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) can color ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coat Of Arms
A coat of arms is a heraldry, heraldic communication design, visual design on an escutcheon (heraldry), escutcheon (i.e., shield), surcoat, or tabard (the last two being outer garments), originating in Europe. The coat of arms on an escutcheon forms the central element of the full achievement (heraldry), heraldic achievement, which in its whole consists of a shield, supporters, a crest (heraldry), crest, and a motto. A coat of arms is traditionally unique to the armiger (e.g. an individual person, family, state, organization, school or corporation). The term "coat of arms" itself, describing in modern times just the heraldic design, originates from the description of the entire medieval chainmail "surcoat" garment used in combat or preparation for the latter. Roll of arms, Rolls of arms are collections of many coats of arms, and since the early Modern Age centuries, they have been a source of information for public showing and tracing the membership of a nobility, noble family, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warrant (law)
A warrant is generally an order that serves as a specific type of authorization, that is, a writ issued by a competent officer, usually a judge or magistrate, that permits an otherwise illegal act that would violate individual rights in order to enforce the law and aid in investigations; affording the person executing the writ protection from damages if the act is performed. A warrant is usually issued by a court and is directed to a sheriff, a constable, or a police officer. Warrants normally issued by a court include search warrants, arrest warrants, and execution warrants. Types * Arrest warrant, issued by a judge to detain someone * Execution warrant, writ issued by a judge authorizing the death of someone * Possessory warrant, a civil writ issued by a judge ordering property searched for, then delivered to a named person * Search warrant, a writ issued by a judge allowing law enforcement to look inside a property * Warrant of committal, issued by a judge ordering ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gemstone
A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewellery, jewelry or other adornments. Certain Rock (geology), rocks (such as lapis lazuli, opal, and obsidian) and occasionally organic chemistry, organic materials that are not minerals (such as amber, Jet (gemstone), jet, and pearl) may also be used for jewelry and are therefore often considered to be gemstones as well. Most gemstones are hard, but some softer minerals such as brazilianite may be used in jewelry because of their color or Lustre (mineralogy), luster or other physical properties that have aesthetic value. However, generally speaking, soft minerals are not typically used as gemstones by virtue of their brittleness and lack of durability. Found all over the world, the industry of coloured gemstones (i.e. anything other than diamonds) is currently estimated at US$1.55billion and is projected to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnification
Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a size ratio called optical magnification. When this number is less than one, it refers to a reduction in size, sometimes called ''de-magnification''. Typically, magnification is related to scaling up visuals or images to be able to see more detail, increasing resolution, using microscope, printing techniques, or digital processing. In all cases, the magnification of the image does not change the perspective of the image. Examples of magnification Some optical instruments provide visual aid by magnifying small or distant subjects. * A magnifying glass, which uses a positive (convex) lens to make things look bigger by allowing the user to hold them closer to their eye. * A telescope, which uses its large objective lens or primary mirror to create an image of a distant object and then allows the user to examine the image closely with a smaller ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
