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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.

 
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