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  2. Grain size - Wikipedia

    en.wikipedia.org/wiki/Grain_size

    Wentworth grain size chart from United States Geological Survey Open-File Report 2006-1195: Note size typos; 33.1mm is 38.1 & .545mm is .594 Beach cobbles at Nash Point, South Wales Grain size (or particle size ) is the diameter of individual grains of sediment , or the lithified particles in clastic rocks .

  3. Alrosa - Wikipedia

    en.wikipedia.org/wiki/ALROSA

    The largest pink diamond previously mined by Alrosa weighed 3.86 carats, one of a total of only three others that the company has mined of over two carats each during the past eight years. The gem is reported to be of jewelry quality, measuring 22.47 x 15.69 x 10.9 millimetres, with a saturated pink tone and practically no defects, according to ...

  4. Zimbabwe - Wikipedia

    en.wikipedia.org/wiki/Zimbabwe

    In terms of carats produced, the Marange field is one of the largest diamond-producing projects in the world, [212] estimated to have produced 12 million carats in 2014 worth over $350 million. [213] As of October 2014, Metallon Corporation was Zimbabwe's largest gold miner. [214] In 2015, Zimbabwe's gold production is 20 metric tonnes. [215

  5. Carbonado - Wikipedia

    en.wikipedia.org/wiki/Carbonado

    Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond. It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite , and amorphous carbon , with minor crystalline precipitates filling pores and occasional reduced metal inclusions. [ 1 ]

  6. Kimberley, Northern Cape - Wikipedia

    en.wikipedia.org/wiki/Kimberley,_Northern_Cape

    It proved to be a 21.25-carat (4.3 g) diamond, and became known as the Eureka. Three years later, in 1869, an 83.5-carat (16.7 g) diamond, which became known as the Star of South Africa , was found nearby ( 29°3′S 23°58′E  /  29.050°S 23.967°E  / -29.050; 23

  7. File:Gold Spot Price per Gram from Jan 1971 to Jan 2012.svg

    en.wikipedia.org/wiki/File:Gold_Spot_Price_per...

    English: This chart shows the nominal price of gold along with the price in 1971 and 2011 dollars (adjusted based on the consumer price index). The historical gold price was obtained from www.igolder.com; CPI was obtained from www.rateinflation.com. The data is in section Chart Data.

  8. Jewels of Elizabeth II - Wikipedia

    en.wikipedia.org/wiki/Jewels_of_Elizabeth_II

    The large diamond, found in South Africa, was presented to Edward VII on his 66th birthday. Two of the stones cut from the diamond were the 94.4-carat (18.88 g) Cullinan III, a clear pear-shaped stone, and a 63.6-carat (12.72 g) cushion-shaped stone. Queen Mary had these stones made into a brooch with the Cullinan III hanging from IV.

  9. Yogo sapphire - Wikipedia

    en.wikipedia.org/wiki/Yogo_sapphire

    The largest recorded Yogo rough, found in 1910, weighed 19 carats (3.8 g) and was cut into an 8-carat (1.6 g) gem. [26] The largest cut Yogo is 10.2-carat (2.04 g). [ 11 ] [ 27 ] [ 28 ] Because of the rarity of large rough Yogo sapphires, Yogo gem prices begin rising sharply when they are over 0.5 carats (0.10 g), and skyrocket when they are ...

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