Hancock Red | Red diamond, while only small, at 0.90 carats, held the world record auction price per carat for any diamond, from 1987 to 2007,
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Hard, Harder Hardest | Diamond is the hardest known naturally occurring substance, although harder substances have been synthethised, including harder diamond! It is likely that naturally occurring harder substance will be discovered in the future, but these as likely to remain rare.
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Hardness | Hardness can be defined and measured in numerous ways. Mohs' hardness scale is the simplest and best known scale. Hardness is directional in most gemstones.
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Harry Winston | Beverley Hills jeweller with a celebrity client list. Has handled a number of large and famous diamonds.
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Hatton Garden | Street and surrounding area on London, one of the two main jewellery trade areas in Britain.
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Heart | A fancy shape of diamond, usually a modified brilliant cut.
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Hearts and Arrows | An optical pattern discernable in some well-proportioned diamonds, and marketed as a demonstration of excellent cutting.
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Heavy (Heavily) Spotted, HS, H.S. | A descriptive diamond clarity grade which appears to be becoming obsolete, two grades below P3 (I3).
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Herkimer | Village, Town, and County in the Adirondack Mountains of New York State. Quart crystals can be found by rockhounds. They are incorrectly and misleadingly described as "Herkimer Diamonds".
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Highest Price | There are various ways of considering the highest price paid for a diamond, total price, per carat price, and relative price in today's money. We will be adding a highest priced diamond page.
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Highest Price Per Carat | From 1987 to 2007, this record was held by the 0.90 carat Hancock's Red, but in October 2007, this was beaten by a 6.04 carat octagonal blue diamond.
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Hofer, Stephen C. | Author of Collecting & Classifying Coloured Diamonds, An Illustrated Study of the Aurora Collection.
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Hope | The world's most famous, and infamous, blue diamond. Also the largest blue diamond, although it only just makes it into the top 100 largest diamonds.
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HRD, H.R.D., Hoge Raad voor Diamant | Translates as "Antwerp Diamond High Council" in English. Represents Belgium and the Belgian diamond industry.
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Hue | An aspect of colour, important factor in viewing and grading fancy coloured diamonds.
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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!