Diamonds are rare, beautiful, and also quite useful. They are the hardest substance found in nature. That means a diamond can cut any other surface. And only another diamond can make a slight cut in a diamond.
    钻石既珍贵稀缺，又美丽晶莹，也用途很广。钻石是自然界里最坚硬的物质。这就意味着钻石能划破任何物体的表面。只有另一块钻石才能在一块钻石上留下轻微的划痕。

    Diamonds are made from carbon. Carbon is found in all living things, both plant and animal. Much of the carbon in the earth comes from things that once lived.
    钻石（金刚石）由纯碳所组成。在一切生物中，包括动物和植物，都含有碳。地球上的绝大部分碳都是来自从前的生物。

1、《珍贵钻石Diamonds视频》第一集

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2、《珍贵钻石Diamonds视频》第二集

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3、《珍贵钻石Diamonds视频》第三集

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4、《珍贵钻石Diamonds视频》第四集

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5、《珍贵钻石Diamonds视频》第五集

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    Scientists know that the combination of extreme heat and pressure changes carbon into diamonds. Such heat and pressure exist only in the hot, liquid mass of molten rock deep inside the earth. It is thought that millions of years ago this liquid mass pushed upward through cracks in the earth's crust. As the liquid cooled, the carbon charged into diamond crystals.
    科学家们都知道，只有在极高的高温和高压这两个条件结合起来的情况下，才能把碳转化成金刚石（钻石）。这种极其高的高温和高压只有在地球内部深处，溶化了的岩石成极热的液体状态下才能存在。据认为在数百万年以前，这种液态的物质冷却以后，纯碳就变成了钻石结晶。