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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.
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.
The Hope Diamond is a 45.52 carats (9.104 g; 0.3211 oz) diamond that has been famed for its great size since the 18th century. Extracted in the 17th century from the Kollur Mine in Guntur, India, [1] [2] the Hope Diamond is a blue diamond.
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.
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]
Rough Diamonds is a Belgian drama television series set in the Orthodox Jewish diamond dealing community of Antwerp. The series premiered on Netflix on April 21, 2023 ...
Gold ring with Old European cut diamonds, late 1800s, Hallwyl Museum. The earliest diamond cutting techniques were simply to polish the natural shape of rough diamonds, often octahedral crystals. [1] Around the 1500s, polishing and cutting inventions made it possible to shape diamonds better, cut facets and make the stones sparkle more. [2]
The diamond was named "Uncle Sam" after the nickname of its finder, Wesley Oley Basham, a worker at the Arkansas Diamond Corporation. [1] [2] [3] The rough diamond as originally discovered weighed 40.23 carats (8.046 g). It was faceted twice by Schenck & Van Haelen of New York, which specialized in Arkansas diamonds, handling over 14,000.