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The 253-carat Oppenheimer Diamond—an uncut diamond does not show its prized optical properties. In colored diamonds, cutting can influence the color grade of the diamond, thereby raising its value. Certain cut shapes are used to intensify the color of the diamond. The radiant cut is an example of this type of cut.
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). [1] The list is not intended to be complete—e.g., the Cullinan (formerly Premier ) mine alone has produced 135 diamonds larger than 200 carats since mining commenced.
Cleavage also plays a helpful role, especially in large stones where the cutter wishes to remove flawed material or to produce more than one stone from the same piece of rough (e.g. Cullinan Diamond). [8] Diamonds crystallize in the diamond cubic crystal system (space group Fd 3 m) and consist of tetrahedrally, covalently
A diamond blade is a saw blade which has diamonds fixed on its edge for cutting hard or abrasive materials. There are many types of diamond blade, and they have many uses, including cutting stone, concrete, asphalt, bricks, coal balls , glass, and ceramics in the construction industry ; cutting semiconductor materials in the semiconductor ...
A diamond cutter apprentice cleaving a diamond prior to cutting it; using a steel wedge-like blade and a small club, supervised by a senior cutter in the Netherlands 1946. In its rough state, a diamond is fairly unremarkable in appearance.
British jeweller Graff bought the rough diamond for $53 million in 2017. By April 2019, Graff had cut it into one large emerald cut diamond, the Graff Lesedi La Rona , weighing 60.5 grams; 2.1 ounces; 1.9 troy ounces (302.37 carats) and 66 smaller stones.
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Raw diamonds from the mines were typically transported to Golconda—now the western part of Hyderabad— [28]) for skilled lapidary, enhancement, further evaluation, and sale. [17] [19] [20] The art of macle, which is a form of rough diamond that is used to produce jewellery, was first developed in the Golconda region. [29]