|
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 impurities of boron within 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 most important criterion for grading a blue diamond and determining its value. However, the most valuable 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 mentioned blue diamonds i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hope Diamond
The Hope Diamond is a blue-violet diamond that has been famed for its great size since the 17th century. It was extracted in the 17th century from the Kollur Mine in Guntur, India,. The Hope Diamond is a blue diamond. Its exceptional size has revealed new information about the formation of diamonds. The Hope Diamond is a Golconda diamond. Its recorded history begins in 1666, when the French gem merchant Jean-Baptiste Tavernier purchased it in India in uncut form. After cutting the gem and renaming it "the French Blue" (''Le bleu de France''), Tavernier sold it to King Louis XIV of France in 1668. It was stolen in 1792, received 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, from whom the diamond's name derives. The Hope Diamond's last private owner was the American jeweler Harry Winston, who bought it in 1947 from the estate of the mining heiress and socialite Evalyn Walsh McLean ... [...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 (Any color that is absent of white, grey, or black)"., 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 t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Golconda
Golconda is a fortified citadel and ruined city located on the western outskirts of Hyderabad, Telangana, India. The fort was originally built by Kakatiya ruler Pratāparudra in the 11th century out of mud walls. It was ceded to the Bahmani Kings from Musunuri Nayakas during the reign of the Bahmani Sultan Mohammed Shah I, during the first Bahmani-Vijayanagar War. Following the death of Sultan Mahmood Shah, the Sultanate disintegrated and Sultan Quli, who had been appointed as the Governor of Hyderabad by the Bahmani Kings, fortified the 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 other forts in the region, under the name Monuments and Forts of the Deccan Sultanat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Africa
South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic Ocean, South Atlantic and Indian Ocean; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; to the east and northeast by Mozambique and Eswatini; and it encloses Lesotho. Covering an area of , the country has Demographics of South Africa, a population of over 64 million people. Pretoria is the administrative capital, while Cape Town, as the seat of Parliament of South Africa, Parliament, is the legislative capital, and Bloemfontein is regarded as the judicial capital. The largest, most populous city is Johannesburg, followed by Cape Town and Durban. Cradle of Humankind, Archaeological findings suggest that various hominid species existed in South Africa about 2.5 million years ago, and modern humans inhabited the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Premier Mine
The Premier Mine is an underground diamond mine owned by Petra Diamonds in the town of Cullinan, Gauteng, Cullinan, east of Pretoria, Gauteng Province, South Africa. Established in 1902, it was renamed the Cullinan Diamond Mine in November 2003 in celebration of its centenary. The mine is a carrot-shaped volcanic pipe and has a surface area of . The mine rose to prominence in 1905, when the Cullinan Diamond – the largest rough diamond of gem quality ever found – was discovered there. The mine has produced over 750 stones that are greater than and more than a quarter of all the world's diamonds that are greater than . It is also the only significant source of blue diamonds in the world. Notable discoveries The Cullinan Diamond is the largest rough gem-quality diamond ever found, at . It was found by Frederick Wells, surface manager of the Premier Diamond Mining Company in Cullinan, Gauteng, South Africa, on 25 January 1905. The stone was named after Sir Thomas Cullina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Qutb Shahi Dynasty
The Sultanate of Golconda (; ) was an early modern kingdom in southern India, ruled by the Persianate, Shia Islamic Qutb Shahi dynasty of Turkoman origin. After the decline of the Bahmani Sultanate, the Sultanate of Golconda was established in 1518 by Quli Qutb Shah, as one of the five Deccan sultanates. The kingdom extended from parts of the modern-day Indian states of Karnataka, Andhra Pradesh, Odisha and Telangana. The Golconda sultanate was constantly in conflict with the Adil Shahis and Nizam Shahis, which it shared borders with in the seventeenth century to the west and northwest.C.E. Bosworth, ''The New Islamic Dynasties'', (Columbia University Press, 1996), 328. 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 D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andhra Pradesh
Andhra Pradesh (ISO 15919, ISO: , , AP) is a States and union territories of India, state on the East Coast of India, east coast of southern India. It is the List of states and union territories of India by area, seventh-largest state and the List of states and union territories of India by population, tenth-most populous in the country. Telugu language, Telugu is the most widely spoken language in the state, as well as its official language. Amaravati is the state capital, while the largest city is Visakhapatnam. Andhra Pradesh shares borders with Odisha to the northeast, Chhattisgarh to the north, Karnataka to the southwest, Tamil Nadu to the south, Telangana to northwest and the Bay of Bengal to the east. It has the Coastline of Andhra Pradesh, third-longest coastline in India at about . Archaeological evidence indicates that Andhra Pradesh has been continuously inhabited for over 247,000 years, from early archaic Hominini, hominins to Neolithic settlements. The earliest r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guntur
Guntur (), natively spelt as Gunturu, is a city in the States and union territories of India, Indian state of Andhra Pradesh and the administrative headquarters of Guntur district. The city is part of the Andhra Pradesh Capital Region and is located on the Eastern Coastal Plains approximately south-west of the state capital Amaravati. According to data from the 2011 Census of India, Guntur had a population of 743,354 in that year, making it the List of cities in Andhra Pradesh by population, third-most-populous city in the state, and occupies of land. The city is the heartland of the state, located in the center of Andhra Pradesh and making it a central part connecting different regions. The city is home to numerous state government offices and agencies. being part of the district capital and being in close proximity to the state capital Amaravati. The city is about 1100 miles south of the national capital New Delhi. It is classified as a ''Y-grade'' city as per the Pay Commi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kollur Mine
The Kollur Mine was a series of gravel-clay pits on the south bank of the Krishna River in the state of Andhra Pradesh, India. It has produced many large diamonds, known as Golconda diamonds, several of which are or have been a part of crown jewels of various empires. The mine was established in the early 17th century and operated until the mid-19th century. History Kollur Mine was discovered around 1619 and was the first of 23 diamond mines to open in Golconda. William Methwold, an English merchant, visited the mine with Andries Soury of the Dutch East India Company during a trip to India in 1621. According to them, between 20,000 and 30,000 people worked at the mine and "jewelers of all the neighbouring nations resorted to the place" following news of its discovery, which had caused a notable fall in diamond prices. Golconda mines were owned by the local king, who leased operation to diamond merchants, either foreigners or Indians of the goldsmith caste. As well as rent, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
India
India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since 2023; and, since its independence in 1947, the world's most populous democracy. 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 near 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 averag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HPHT Method
A synthetic diamond or laboratory-grown diamond (LGD), also called a lab-grown, laboratory-created, man-made, artisan-created, artificial, or cultured diamond, is a diamond that is produced in a controlled technological process, in contrast to a 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 have identical chemical and physical properties. The maximal size of synthetic diamonds has increased dramatically in the 21st century. Before 2010, most synthetic diamonds were smaller than half a carat. Improvements in technology, plus the availability of larger diamond substrates, have led to synthetic diamonds up to 125 carats in 2025.=https://www.gia.edu/gia-news-research/gems-gemology-summary-la ... [...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, questioned document examination, and watchmaking. Loupes are also somet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
