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Diamond facets.gif is licensed under the GNU Free Documentation License; that is the license under which this derivitive work (Diamond_facets.svg) was made. The uploader of the svg file ( User:Danuthaiduc ) placed the derivation of the svg file from the gif file into the Public Domain, using the PD-self template.
Marketing has significantly affected the image of diamond as a valuable commodity. N. W. Ayer & Son, the advertising firm retained by De Beers in the mid-20th century, succeeded in reviving the American diamond market and the firm created new markets in countries where no diamond tradition had existed before. N. W.
The Millennium Star is a diamond owned by De Beers. At 203.04 carats (40.608 g), it is the world's second-largest known top-color (grade D, i.e., colorless), internally and externally flawless, pear-shaped diamond. The diamond was discovered in the Mbuji-Mayi district of Zaire in 1990 in alluvial deposits; uncut, it was 777 carats (155.4 g). De ...
Diamonds with higher color grades are rarer, in higher demand, and therefore more expensive, than lower color grades. Oddly enough, diamonds graded Z are also rare, and the bright yellow color is also highly valued. Diamonds graded D–F are considered "colorless", G–J are considered "near-colorless", K–M are "slightly colored".
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In diamonds, the cut is the primary determinant of value, followed by clarity and color. An ideally cut diamond will sparkle, to break down light into its constituent rainbow colors (dispersion), chop it up into bright little pieces (scintillation), and deliver it to the eye (brilliance).
Diamond is extremely strong owing to its crystal structure, known as diamond cubic, in which each carbon atom has four neighbors covalently bonded to it. Bulk cubic boron nitride (c-BN) is nearly as hard as diamond. Diamond reacts with some materials, such as steel, and c-BN wears less when cutting or abrading such material. [4]
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