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Blue Diamonds
Blue diamond is a type of diamond which exhibits all of the same inherent properties of the mineral except with the additional element of blue color in the stone. They are colored blue by trace amounts of boron that contaminate the crystalline lattice structure. Blue diamonds belong to a subcategory of diamonds called fancy color diamonds, the generic name for diamonds that exhibit intense color. Properties determining value The same four basic parameters that govern the grading of all gemstones are used to grade blue diamonds–the four Cs of Connoisseurship: ''color'', ''clarity,'' ''cut'' and ''carat weight''. Color is considered the absolute most important criterion in grading a blue diamond and determining its value. However, the most valuable of blue diamonds also exhibit the highest clarity grades. There is no known blue diamond with a completely flawless (F) clarity grading, although several are known which are graded Internally Flawless (IF). One of the earliest mentio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hope Diamond
The Hope Diamond is a diamond originally extracted in the 17th century from the Kollur Mine in Guntur, India. It is blue in color due to trace amounts of boron. Its exceptional size has revealed new information about the formation of diamonds. The stone is known as one of the Golconda diamonds. The earliest records of the diamond show that French gem merchant Jean-Baptiste Tavernier purchased it in 1666 as the Tavernier Blue. The stone was cut and renamed the French Blue (''Le bleu de France''); Tavernier sold the stone to King Louis XIV of France in 1668. It was stolen in 1792 and re-cut, with the largest section of the diamond appearing under the Hope name in an 1839 gem catalogue from the Hope banking family. The diamond has had several owners, including Washington socialite Evalyn Walsh McLean, who was often seen wearing it. New York gem merchant Harry Winston purchased the diamond in 1949, touring it for several years before donating it in 1958 to the Smithsonian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saturation (color Theory)
Colorfulness, chroma and saturation are attributes of perceived color relating to chromatic intensity. As defined formally by the International Commission on Illumination (CIE) they respectively describe three different aspects of chromatic intensity, but the terms are often used loosely and interchangeably in contexts where these aspects are not clearly distinguished. The precise meanings of the terms vary by what other functions they are dependent on. * Colorfulness is the "attribute of a visual perception according to which the perceived color of an area appears to be more or less chromatic"., page 87. The colorfulness evoked by an object depends not only on its spectral reflectance but also on the strength of the illumination, and increases with the latter unless the brightness is very high ( Hunt effect). * Chroma is the "colorfulness of an area judged as a proportion of the brightness of a similarly illuminated area that appears white or highly transmitting". As a resu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Golconda
Fort (Telugu: గోల్కొండ, romanized: ''Gōlkōnḍa'') is a historic fortress and ruined city located in Hyderabad, Telangana, India. It was originally called Mankal. The fort was originally built by Kakatiya ruler Pratāparudra in the 11th century out of mud walls. It was ceded to the Bahmani Kings by Deo Rai, Rajah of Warangal during the reign of Sultan Muhammad Shah (1358-1375 A.D.) of the Bahmani Sultanate. Following the death of Sultan Mahmood Shah, the Sultanate disintegrated and Sultan Quli, who had been appointed as the Governor of Telangana by the Bahmani Kings, fortified city and made it the capital of the Golconda Sultanate. Because of the vicinity of diamond mines, especially Kollur Mine, Golconda flourished as a trade centre of large diamonds known as Golconda Diamonds. Golconda Fort is currently abandoned and in ruins. The complex was put by UNESCO on its "tentative list" to become a World Heritage Site in 2014, with others in the region, unde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; and to the east and northeast by Mozambique and Eswatini. It also completely enclaves the country Lesotho. It is the southernmost country on the mainland of the Old World, and the second-most populous country located entirely south of the equator, after Tanzania. South Africa is a biodiversity hotspot, with unique biomes, plant and animal life. With over 60 million people, the country is the world's 24th-most populous nation and covers an area of . South Africa has three capital cities, with the executive, judicial and legislative branches of government based in Pretoria, Bloemfontein, and Cape Town respectively. The largest city is Johannesburg. About 80% of the population are Black Sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cullinan Mine , a residential estate in Hong Kong
{{disambiguation ...
Cullinan may refer to: * Cullinan (surname), a surname *Rolls-Royce Cullinan, an ultra-luxury SUV produced by Rolls-Royce Motor Cars * Cullinan, Gauteng, a small town in South Africa * Cullinan Diamond, the largest rough gem-quality diamond ever found * Cullinan Finance, an SIV (structured investment vehicle) run by HSBC *The Cullinan The Cullinan is a luxury private housing estate located in the Union Square, West Kowloon, Hong Kong. The building has glass curtain walls and views of Victoria Harbour. The glass facade matches the design language of the neighbouring I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Qutb Shahi Dynasty
The Qutb Shahi dynasty also called as Golconda Sultanate ( Persian: ''Qutb Shāhiyān'' or ''Sultanat-e Golkonde'') was a Persianate Shia Islam dynasty of Turkoman origin that ruled the sultanate of Golkonda in southern India. After the collapse of Bahmani Sultanate, the Qutb Shahi dynasty was established in 1512 AD by Sultan-Quli Qutb-ul-Mulk, better known though less correctly referred to in English as " Quli Qutb Shah". In 1636, Mughal emperor Shah Jahan forced the Qutb Shahis to recognize Mughal suzerainty and pay periodic tributes. The dynasty came to an end in 1687 during the reign of its seventh sultan Abul Hasan Qutb Shah, when the Mughal ruler Aurangzeb arrested and jailed Abul Hasan for the rest of his life in Daulatabad, incorporating Golconda into the Mughal empire. The kingdom extended from the parts of modern-day states of Karnataka, Andhra Pradesh, Odisha and Telangana. The Golconda sultanate was constantly in conflict with the Adil Shahis and Nizam Shahi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andhra Pradesh
Andhra Pradesh (, abbr. AP) is a state in the south-eastern coastal region of India. It is the seventh-largest state by area covering an area of and tenth-most populous state with 49,386,799 inhabitants. It is bordered by Telangana to the north-west, Chhattisgarh to the north, Odisha to the north-east, Tamil Nadu to the south, Karnataka to the west and the Bay of Bengal to the east. It has the second longest coastline in India after Gujarat, of about . Andhra State was the first state to be formed on a linguistic basis in India on 1 October 1953. On 1 November 1956, Andhra State was merged with the Telugu-speaking areas (ten districts) of the Hyderabad State to form United Andhra Pradesh. ln 2014 these merged areas of Hyderabad State are bifurcated from United Andhra Pradesh to form new state Telangana . Present form of Andhra similar to Andhra state.but some mandalas like Bhadrachalam still with Telangana. Visakhapatnam, Guntur, Kurnool is People Capital ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guntur
Guntur () is a city and the administrative headquarters of Guntur district in the Indian state of Andhra Pradesh. Guntur is spread across 168.49 km square and is the third-largest city in the state. It is situated to the west of the Bay of Bengal, on the Eastern Coastal Plains. The city is the heartland of the state, located in the centre of Andhra Pradesh and making it a central part connecting different regions. It serves as a major hub for exports chilli, cotton and tobacco and has the largest chili market yard in Asia. It is a major transportation, education and commercial hub for the state. Guntur city is a municipal corporation and also the headquarters of Guntur East and Guntur West mandals in Guntur revenue division. The city region is a major part of Amaravati Metropolitan Region. census of India the city is the third most populous in the state with a population of 743,354. It is classified as a ''Y-grade'' city as per the Seventh Central Pay Commiss ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kollur Mine
Kollur Mine was a series of gravel-clay pits on the south bank of the Krishna River in the Golconda Sultanate of India. It currently falls within the state of Andhra Pradesh. It is thought to have produced many large diamonds, known as Golconda diamonds, several of which are or have been a part of crown jewels. The mine was established in the 16th century and operated until the 19th century. History Kollur Mine operated between the 16th and mid-19th centuries, and was one of the largest and most productive diamond mines on the Indian subcontinent. At the height of production, around 30,000 – 60,000 people worked there, including men, women, and children of all ages. Kollur itself had a population of around 100,000. Golconda mines were owned by the king, but operation was leased to diamond merchants, either foreigners or Indians of the goldsmith caste. As well as rent, the king also received 2% from sales and he was entitled to keep all diamonds weighing over 10 ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
India
India, officially the Republic of India ( Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; China, Nepal, and Bhutan to the north; and Bangladesh and Myanmar to the east. In the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives; its Andaman and Nicobar Islands share a maritime border with Thailand, Myanmar, and Indonesia. Modern humans arrived on the Indian subcontinent from Africa no later than 55,000 years ago., "Y-Chromosome and Mt-DNA data support the colonization of South Asia by modern humans originating in Africa. ... Coalescence dates for most non-European populations average to between 73–55 ka.", "Modern human beings—''Homo sapiens''—originated in Africa. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HPHT Method
Lab-grown diamond (LGD; also called laboratory-grown, laboratory-created, man-made, artisan-created, artificial, synthetic, or cultured diamond) is diamond that is produced in a controlled technological process (in contrast to naturally formed diamond, which is created through geological processes and obtained by mining). Unlike diamond simulants (imitations of diamond made of superficially-similar non-diamond materials), synthetic diamonds are composed of the same material as naturally formed diamonds – pure carbon crystallized in an isotropic 3D form – and share identical chemical and physical properties. Numerous claims of diamond synthesis were reported between 1879 and 1928; most of these attempts were carefully analyzed but none was confirmed. In the 1940s, systematic research of diamond creation began in the United States, Sweden and the Soviet Union, which culminated in the first reproducible synthesis in 1953. Further research activity yielded the discoveries of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loupe
A loupe ( ) is a simple, small magnification device used to see small details more closely. They generally have higher magnification than a magnifying glass, and are designed to be held or worn close to the eye. A loupe does not have an attached handle, and its focusing lens(es) are contained in an opaque cylinder or cone. On some loupes this cylinder folds into an enclosing housing that protects the lenses when not in use. Optics Three basic types of loupes exist: * Simple lenses, generally used for low-magnification designs because of high optical aberration. * Compound lenses, generally used for higher magnifications to control optical aberration. * Prismatic, multiple lenses with prisms. Uses Loupes are used in many professions where magnification enables precision work to be done with greater efficiency and ease. Examples include surgery, dentistry, ophthalmology, the jewelry trade, gemology, and watchmaking. Loupes are also sometimes used in photography and printin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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