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rati PDF Print E-mail
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Monday, 29 October 2007

rati (ratti, rutee). An Indian unit of gemstone weight. Formerly, this pea­like scarlet seed of the licorice family was used as a weight; about 1.75 grains Troy. Today, the rati equals 0.91 carats.

 
Rand PDF Print E-mail
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Monday, 29 October 2007

Rand. (1) The basic monetary unit of the Republic of South Africa; the rand is divided into 100 cents. (2) Rand, the Afrikaans word meaning ridge of white waters. In the Repub­lic of South Africa, "The Rand" is used as an abbreviation for the Wit-watersrand, a series of east-west mountain ranges running across the Province of Transvaal, which is the greatest gold-producing area in the world.

 
Ramat Gan PDF Print E-mail
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Monday, 29 October 2007

Ramat Gan. A suburb of Tel Aviv where the main cutting center and diamond commercial area of Israel are located. See cutting centers.

 
RAL PDF Print E-mail
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Monday, 29 October 2007

RAL. Acronym for Reichs-Ausschuss fur Lieferbedingunger and Gutesich-erung beim DNA, the German Standards Association Commission on diamond grading standards and nomenclature.

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

Rajah diamond. Reported to be one of two large Diamonds (the other being the Light of India diamond) that belonged to the late Boston socialite, Mrs. Jack Gardner. The stones were purchased from Tiffany'sin 1886 and according to the bill of sale they weighed 25.5 carats and 12.38 carats. Unfortunately, the bill did not specify which diamond had which weight. Owned by another Bostonian; name undisclosed. See

LIGHT OF INDIA diamond.

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

"Rainbow diamond." A misleading trade name for synthetic rutile.

"Rainbow Gem." A trade name for synthetic rutile.

"Rainbow Magic diamond." A mis­leading trade name for synthetic ru­tile.

 
radius-dressing diamond tool PDF Print E-mail
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Monday, 29 October 2007
radius-dressing diamond tool. A single-diamond dressing tool for dressing radial forms in grinding wheels.
 
radium-treated diamond PDF Print E-mail
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Monday, 29 October 2007
radium-treated diamond. A diamond whose color has been changed (usu­ally to greenish) as a result of being exposed to the radioactive emana­tions of radium salts. Because of the prolonged radioactivity of Diamonds thus treated and consequent danger of injury to the finger of the wearer, this form of color alteration is not practiced commercially.
 
radioisotope PDF Print E-mail
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Monday, 29 October 2007

radioisotope. An unstable isotope of an element that decays or disinte­grates spontaneously, emitting radi­ation. Radioactive cobalt, cobalt-60, is one of the most common radioisotopes with a half-life of 5.3 years; radiation, beta and gamma. Cobalt-60 emits gamma rays which have about the same penetrating power as those of radium. Used for color treating Gemstones.

 
quarter quasima diamond Quebec diamond Queen Elizabeth Pink Diamond PDF Print E-mail
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Sunday, 23 September 2007

quality, factors that determine. The quality of a diamond can be rated only when the following factors have been analyzed: carat weight; propor­tions and finish (cutting); clarity, or imperfection, grade; color grade; and shape, or style of cutting. See

CUTTING; CLARITY OR IMPERFECTION GRADE; COLOR GRADE; FINISH; SYMMETRY; PROPOR­TIONS; PROPORTIONS, GOOD.

quarter. A common abbreviation for a quarter carat.

quartz. Silicon dioxide (SiCh), hexa­gonal, hardness 7, S.G. 2.65, R.I. 1.544-1.553, birefringence 0.009, dispersion 0.013. One of the most common and widelydistributed minerals. Sometimes used as a dia­mond simulant.

quasima diamond. A misnomer used in Arabia for rock crystal.

Quebec diamond. A misnomer for rock crystal.

Queen Elizabeth Pink diamond. See

WILLIAMSON diamond.

Queen Frederica diamond. An en­graved, wafer-thin, colorless dia­mond, weighing slightly less than two carats and measuring 7 x 10 mm. It bears the portrait of Frederica Louisa Wilhelmina, wife of William I, Prince of Orange and the first king of the Netherlands. She was the great-great grandmother of present Queen Juliana. The stone is owned by Max Fine & Sons, Inc., New York City, in which family it has been since 1920.

Queen of Albania diamond. Repor­tedly, this 49.03-carat pear-shape be­longed to Geraldine, Queen of Albania and was put up for auction at Christie's, London, in 1960. How­ever, bids were below the acceptable minimum and Christie's bid in at $182,000 to protect the owner. Its ownership and whereabouts are un­known today. Some gem historians speculate that the Queen of Albania is the P/'gott.

Queen of Belgium diamond. This 40-carat emerald-cut diamond was

formerly a 50-carat cushion-shaped stone that belonged to Queen Marie Henrietta of Belgium, wife of King Leopold II. It had been given to her by her mother, the wife of Archduke loseph, Palatine of Hungary. In its 40-carat version, the Queen of Bel­gium was once handled by Harry Winston, New York City gem dealer, but its present location and owner are not known. Alternate names: La Reine diamond, La Reine Des Beiges diamond, and Des Beiges diamond.

Queen of Holland diamond. A 136.25-carat cushion-cut brilliant, described as an "intense blue." It was cut in Amsterdam in 1904 and was owned there for many years by the firm of F. Friedman. In 1925, it was exhibited at the Paris Exposition of Arts and Industry. Later, it was sold by a Paris jeweler to an Indian maharaiah for an estimated $1,000,000. The present whereabouts of this diamond are not known. Queensland. See Australia

 
pure purest water Putfontein Pypklip PDF Print E-mail
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Sunday, 23 September 2007

pure. A rarely used term that refers to comparative perfection; more or less synonymous with clean

. purest water. A little-used quality des­ignation for highly transparent dia­monds of fine color. See water.

Purnendu diamond-Mining Works. A diamond-mining company in the Panna district, Madhya Pradesh, In­dia. See india.

Puruni River. A source of Diamonds in Guyana, formerly British Guiana.

See GUYANA.

Putfontein. A minor alluvial dia­mond deposit in the Lichtenburg area, Transvaal Province, Republic of South Africa.

Pypklip. One of the more important alluvial diamond deposits in the Lichtenburg area, Transvaal Province, Republic of South Africa. Production figures from this area for one recent year credited Pypklip with approxi­mately 2050 carats.

pyrope. This species of the garnet group is used as an indicator of the presence of Diamonds. It is resistant to wear and can survive being trans­ported many miles from its source
 
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