[PDF] DOWNLOAD Collecting and Classifying Coloured Diamonds: Colour: Perception, Measurement, Appearance (An Illustrated

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3. Collecting and Classifying Coloured Diamonds: Colour: Perception, Measurement, Appearance (An Illustrated Study of the Aurora Collection Book 2) Sinopsis : Note to Reader In order to reintroduce Collecting and Classifying Coloured Diamonds: An Illustrated Study of the Aurora Collection (&#169 S. Hofer 1998), in a convenient eBook format (accessible anywhere in the world), we had to eak the massive 742-page original into 4 parts:Book One - Introduction, Collecting, Rarity, Value Book Two - Colour: Perception, Measurement, Appearance Book Three - Colour: Varieties, Modifiers, Tones Book Four - Diagrams, Glossary, BibliographyEvery page of the original has been meticulously rebuilt to take advantage of the eBook format. We trust you will you once again (or for the first time) find this extremely detailed reference book a valuable addition to your practice, enabling anyone with an interest in this subject to buy, sell and communicate coloured diamonds with greater understanding and confidence. Furthermore, we are pleased to make the full- color eBook available at a fraction of the original print edition cost.Book two contains the following chaptersPerception: The Art of Seeing ColourGrading: The Science of Specifying ColourBasic Colour ScienceLight Sources Observers Objects Visual Colour OrderColour and Its Measurement The CIE System of Colour Specification CIE Standard llluminants CIE Standard Observers Illuminating and Viewing Geometries Application of CIE DataThe Specification of Diamonds by Colour Appearance: Defining Face-up ColourTransparent Colourless Diamond Transparent Coloured DiamondReviewIn 1987, a ninety-five point (0.95 ct) fancy purplish red sold for 928,315 per carat, or one hundred forty-five million dollars per

4. ounce! At that point any lingering doubts about the value of rare natural coloured were erased, colored diamonds were not only the most expensive items on earth, their prices had entered outer space (i.e., this sale solidified natural coloured diamonds as the most concentrated form of wealth on the planet)!According to many industry experts (e.g., Dr. J. Arem, author of the highly acclaimed Color Encyclopedia of Gemstones), Stephen Hofer's book is the most comprehensive book ever written on colored diamonds. To call Hofer's book comprehensive is, in fact, something of an understatement. Collecting and Classifying Coloured Diamonds ranks not only as a definitive treatment of colored diamonds, it also contains one of the most interesting and relevant essays on the subject of color perception and colour science as it relates to gemstones yet published.The major theme of Collecting and Classifying Coloured Diamonds is a thorough study of the famous Aurora Collection of colored diamonds. Along the way, Hofer also offers a logical new approach to colored diamond grading and a simple color classification system (referred to as the Universal Diamond Colour Language, UDCL), which includes a new short-hand method of colour notation (e.g., bluish green = b-G, blue-green = B-G, grayish blue-green = gy- B-G), and an excellent essay on gemstone lighting and its effect on colour appearance.For more information, visit http://colourdiamondexpert.com