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Round Brilliant Cut Diamond
Round Brilliant Cut Diamond

A to Z of Diamonds Glossary
Alphabetical list of main words and terms relating to diamond or diamonds, containing over 600 entries, with definitions, explanations and links to more detailed information.
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UK, U.K., United KingdomHome of Hatton Garden, London, and of one of De Beers main offices.
Ultraviolet, UV, U.V.High frequency, short wavelength electromagnetic radiation, between visible light and X-rays.
UncutUncut diamonds are usually referred to as "rough". It applies to all unpolished diamonds.
UnpolishedUnpolished diamonds are usually referred to as "rough". It applies to all uncut diamonds.
UnmountedA diamond which is loose, not set in a piece of jewellery.
Upper Girdle FacetAny of the sixteen facets on the crown (top), adjoining the girdle of a diamond.
USA, U.S.A.The largest consumer market for diamonds.

There are currently over 600 entries in this table.
Over 90 of them have page links to a page on this site. Eventually, we intend to add a more complete description for most entries, each on its own page. Please watch this space!

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