Read the passage given below carefully and then answer the questions given below the passage. Scarce diamonds are more valuable than the clusters of small crystals known as bort and Carbonado. These diamonds are large single crystals of genuine crystalline carbon. Diamonds are found in diamantifer

Read the passage given below carefully and then answer the questions given below the passage.

Scarce diamonds are more valuable than the clusters of small crystals known as bort and Carbonado. These diamonds are large single crystals of genuine crystalline carbon.

Diamonds are found in diamantiferous earth that is located in both open-air pits and underground mines. To retrieve diamonds, the earth is crushed and concentrated. The concentrated material is then sorted by passing it over streams of water on greased tables. Since diamonds are water repellent they will stick to the grease while the other minerals will absorb water and pass over the grease. The diamonds are then removed from the grease and cleaned, examined, sorted and graded. The best diamonds are noted for the cleavage, their translucence, and their color.

All diamonds have a natural line of cleavage along which they may be split and it is essential to split them. Before they are cut and polished, they look like tiny blue-grey stones; they do not twinkle or shine yet. A perfectly cut and polished diamond has 58 faces arranged regularly over its surface. It will be translucent and colorless, blue, white, green or yellow. The value of a jewel diamond depends largely on its color or 'water', as it is called professionally. A stone of finest water is blue-white.

            

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