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rhomboid cut PDF Print E-mail
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Monday, 29 October 2007
rhomboid cut. A four-sided paral­lelogram-shaped form of cutting, usually step cut.

R.I. The abbreviation for refractive index.

Riccia diamond. A 15-carat rose-colored diamond owned by the Prince de la Riccia. No additional in­formation is available.

 
Rhodesia PDF Print E-mail
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Monday, 29 October 2007

Rhodesia. The Federation of Rhodesia and Nyasaland, an African country consisting of Northern and Southern Rhodesia and Nyasaland, has been an insignificant producer of Diamonds for many years. In 1908, it was prospected carefully for dia­monds and for a time a few hundred carats were found yearly, but none of the deposits ever proved payable and the search was abandoned. In­frequent organized prospecting ven­tures since 1908 have been no more successful. In 1955, however, De Beers Consolidated Mines, Ltd., re­newed its interest in this country and organized De Beers Prospecting (Rhodesian Areas), Ltd., to undertake further exploratory work in Northern Rhodesia. The diamond deposits are known as the Somabula field, and are located near Gwelo

 
Rhodes, Cecil John PDF Print E-mail
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Monday, 29 October 2007

Rhodes, Cecil John (1853-1902). En­glish colonial statesman and pioneer of diamond-market control in South Africa. In 1870, he went to South Af­rica for his health, joining an older brother in Natal. The brothers par­ticipated in the diamond rush in Griqualand West, in Cape Province, in 1871, and soon were among the most prosperous of the diggers. After a trip through the country, he con­ceived his idea of a United Empire under the British Crown, visualizing South Africa as a tremendous source of mineral wealth. Eventually, he succeeded in consolidating a number of claims within the De Beers Mine and formed the De Beers Mining Co., in 1888. The merger be­tween the Rhodes' and Barnato interests, which concerned the entire De Beers Mine and the greater part of the Kimberley Mine, led to the in­corporation of De Beers Consoli­dated Mines, Ltd., in the same year. Shortly afterwards, De Beers Consolidated Mines acquired a 100% interest in the Kimberley, Dutoitspan and Bultfontein Mines, thus gaining control of the diamond market and becoming the most influential factor in the industry. Rhodes became the first chairman of De Beers and held office until his death in 1902. Rhodesia was named in honor of him. See de beers consolidated mines,

LTD.; BARNATO, BARNETT.

 
Retail Jewelers of America PDF Print E-mail
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Monday, 29 October 2007

Retail Jewelers of America, Inc. Ab­breviated RJA. A national trade or­ganization that was formed in 1957 upon merger of the American Na­tional Retail jeweler's Association and the National jeweler's Associa­tion. The purpose of the organization is to promote the general welfare, and prosperity of the retail jewelry industry. Over 42 state jewelers' as­sociations are affiliated with the RJA; membership in a state association automatically establishes member­ship in the RJA, and vice versa, thus creating a national team of retail jewelers. The organization sponsors and manages two National Jewelry Trade Shows per year in New York City. Headquarters: 10 Rooney Cir­cle, West Orange, New Jersey 07052.

 
restricted alluvial digging PDF Print E-mail
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Monday, 29 October 2007

restricted alluvial digging. A term used in the Republic of South Africa for alluvial diamond diggings upon which the number of persons who can work each claim is restricted by the government. See proclaimed area, deproclaimed area.

 
repeated twinning PDF Print E-mail
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Monday, 29 October 2007

repeated twinning. Three or more crystals united according to the same crystallographic law, with the twin­ning planes parallel. See polysynthetic

TWINNING, KNOT LINES, TWINNING LINES.

Replique. Trade name for man-made yttrium aluminum garnet (YAG). resistivity. The electrical resistance offered to the passage of an electrical current. Usually expressed in ohm meters. Type I and lla stones are gen­erally classed as good insulators, i.e., good resistors to electricity. In con­trast, Type lib stones are semi­conductors of electricity.

 
regular Reitz Diamond PDF Print E-mail
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Monday, 29 October 2007

regular. The abbreviation for regular octahedron, the classic shape of a rough diamond.

Reitz diamond. See jubilee diamond,

rejection chip. A grading term used at the mines for a small misshapen diamond crystal or a broken piece of inferior quality.

rejection stone. (1) A grading term used at the mines for a diamond crystal that is inferior in quality rela­tive to a spotted stone, because il contains more inclusions. (2) Also a stone or stones of an assortment which is so poor that it is unsuitable for gem use. See spotted stone.

 
Registered Jeweler PDF Print E-mail
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Monday, 29 October 2007
Registered jeweler. A title that is awarded by the American Gem So­ciety to qualified retail jewelers.

After membership in the Society is at­tained, the title is secured by suc­cessful completion of the com­prehensive proctored examinations based on prescribed coursework. Registered Jewelers use the title as an important feature of their advertising.

See AMERICAN GEM SOCIETY, CERTIFIED CEM-OLOGIST, REGISTERED SUPPLIER.

Last Updated ( Monday, 29 October 2007 )
 
Regent of Portugal Diamond PDF Print E-mail
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Monday, 29 October 2007

Regent of Portugal diamond. A Brazilian stone, found in 1775, cut into a 215-carat round brilliant. It is thought to be a topaz, not a dia­mond. Additional details lacking.

 
Regent Diamond PDF Print E-mail
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Monday, 29 October 2007

Regent diamond. Originally known as the Pitt diamond, this 410-carat diamond was one of the last large stones found in India; it is said to have come from the Parteal Mines on the Kristna River about 1701. It was sold to Governor Thomas Pitt, of Ft. George, Madras, who was the great grandfather of William Pitt of American Revolutionary fame, for approximately $100,000. He sent it lo England and had it cut into a 140.50-carat cushion-shaped brilliant that measured 1-1/16 inches long, 1 inch wide, and 3A inch deep. The stone, which has but one very small imperfection, is today considered one of the finest and most brilliant of (he known large Diamonds. In 1717, it was sold to the Duke of Orleans, then Regent of France, for about $500,000; since it has been known as the Regent diamond. It was set in the crown of Louis XV, and Marie Antoinette is said to have worn it in a large black-velvet hat. It disappeared in the French jewel rob­bery of 1792 but was found again in a Paris garret and was pledged for money that helped Napoleon in his rise to power. He had it mounted in the hilt of the sword that he carried that time, at his coronation. When Napoleon went into exile, Marie Louise, his second wife, carried the Regent to the Chateau de Blois. Later, however, her father, the Emperor of Austria, re­turned it to France and it again be­came part of the French Crown Jewels; many of these were sold at auction in 1887, but the Regent was reserved. In 1940, when the Ger­mans invaded Paris, it was again sent to the chateau country, this time to Chambord, where it was secreted behind a stone panel. After the War, it was returned to Paris and placed on display in the Apollon Gallery of the Louvre Museum. Also sometimes known as the Millionaire diamond.

 
Regale of France Diamond PDF Print E-mail
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Monday, 29 October 2007

Regale of France diamond. A legen­dary stone, said to have been as large as a "bird's egg." St. Louis (King I ouis IX, of France), according to the story, disguised as a poor pilgrim, brought the stone as an offering to Ihe Shrine of St. Thomas a Becket, in England, and received in return a small leaden figure of St. Thomas. Ihe whereabouts of the diamond today is not known.

 
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