Valued at 250 million dollars, the Hope diamond is the world's largest and most perfect naturaldiamond.
希望之钻价值两亿五千万美元，是世界上最大也最完美的天然钻石。
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The commercial value of naturaldiamond is often influenced by some coloring ions and inclusions in diamond.
天然钻石常因含各种呈色离子及包裹体等而大大影响了其商业价值。
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Naturaldiamond with seed crystal is discovered for the first time in Hunan Province by the study of synchrotron radiation X-ray diffraction topography.