On May 27th, 1971, Christie's auction house in Geneva offered to prospective buyers a cushion-cut, 104.52 carat (20.904 g) fancy golden-yellow diamond which would later come to be known as the Deepdene. May 27 is the 147th day (148th in leap years) of the year in the Gregorian calendar, with 218 days remaining. ... 1971 (MCMLXXI) was a common year starting on Friday (the link is to a full 1971 calendar). ... Christies Auction Room in London circa 1808. ... Geneva (pronunciation //; French: Genève //, German:   //, Italian: Ginevra) is the second most populous city in Switzerland (after Zürich), and is the most populous city of Romandy (the French-speaking part of Switzerland). ... Meanings of carat or karat: In the gem business: Carat (mass) is a unit of mass for gems. ... This article is about the gemstone. ...

Its clarity was stated as VVS1 (with two very small imperfections near the girdle or midsection of the stone) and its vivid-yellow colour guaranteed to be natural by both the German gemmological institute and the University of Mainz. Gemology (gemmology outside the United States) is the science, art and profession of identifying and evaluating gemstones. ... Johannes Gutenberg University of Mainz (Johannes Gutenberg-Universität Mainz) is a university in the city of Mainz, Germany. ...

However, Dr. Edward Gübelin, also of Geneva, had the opportunity to inspect the diamond before the auction took place. Gübelin had a keen eye and experience with examining gems; he was adept at recognizing an artificially colored diamond. The Deepdene had been irradiated, likely by neutron bombardment. Gübelin warned Christie's and any buyers who would listen, but the sale was allowed to continue with the recommendation that it be examined by another lab. A selection of gemstone pebbles made by tumbling rough rock with abrasive grit, in a rotating drum. ... Irradiation is the process by which an item is exposed to radiation. ... This article or section does not cite its references or sources. ...

After being sold to jewellers Van Cleef & Arpels for a reported £190,000, the Deepdene was sent to the Gem Testing Laboratory in London, England. The lab's director, gemmological pioneer Basil Anderson, was given the task of substantiating Gübelin's claims. That he did, using spectral analysis with damning results. A famous French jewelry house; its origins in 1896 lay in the hands of Alfred Van Cleef and his father in law Salomon Arpels. ... This article is about the capital of England and the United Kingdom. ... Motto: (French for God and my right) Anthem: God Save the King/Queen Capital London Largest city London Official language(s) English (de facto) Unification    - by Athelstan AD 927  Area    - Total 130,395 km² (1st in UK)   50,346 sq mi  Population    - 2006 est. ... A spectrum analyzer is a device used to examine the spectral composition of some electrical, acoustic, or optical waveform. ...

Van Cleef & Arpels promptly returned the unfortunate stone for a refund, leaving it somewhat of an unwanted orphan. Its current whereabouts remain uncertain. A famous French jewelry house; its origins in 1896 lay in the hands of Alfred Van Cleef and his father in law Salomon Arpels. ...

The Deepdene gets its name from the Pennsylvania estate of Mrs. Bok, wife of Cary W. Bok, both the diamond's original owners. At the time, the Deepdene weighed slightly more at 104.88 carats (20.976 g) and was mounted in a diamond clip. Harry Winston bought the diamond from the Boks in 1954 and it eventually found its way to a London firm in 1960 and later to its German owner. Assuming Winston did not have the irradiation treatment done, it could have taken place any time between 1955 (when Winston sold it) to 1971, the year it was offered at auction. In any event, the Deepdene is widely considered to be the largest irradiated diamond in the world. Official language(s) None Capital Harrisburg Largest city Philadelphia Area  Ranked 33rd  - Total 46,055 sq mi (119,283 km²)  - Width 280 miles (455 km)  - Length 160 miles (255 km)  - % water 2. ... This article does not cite its references or sources. ... 1954 (MCMLIV) was a common year starting on Friday of the Gregorian calendar. ... 1960 (MCMLX) was a leap year starting on Friday (the link is to a full 1960 calendar). ...

Other meanings

Deepdene is also the name of a Melbourne, State of Victoria, Australia locality which is a part of the greater suburb Balwyn. Melbournes Yarra River is a popular area for walking, jogging, cycling, rowing and for relaxing on the banks with a picnic Melbourne (pronounced ) is the second most populous city in Australia, with a metropolitan area population of approximately 3. ... Capital Melbourne Government Const. ... Balwyn is a suburb of Australia, in the state of Victoria. ...

An area of the Surrey town Dorking, England. Not to be confused with Surry. ... Dorking is a market town nestling under the North Downs approximately 25 miles south of London, in Surrey in England. ... Motto: (French for God and my right) Anthem: God Save the King/Queen Capital London Largest city London Official language(s) English (de facto) Unification    - by Athelstan AD 927  Area    - Total 130,395 km² (1st in UK)   50,346 sq mi  Population    - 2006 est. ...