Valued at 250 million dollars, the Hope diamond is the world's largest and most perfect natural diamond.

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 natural diamond 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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Natural diamond with seed crystal is discovered for the first time in Hunan Province by the study of synchrotron radiation X-ray diffraction topography.

利用同步辐射X射线形貌学研究，首次发现湖南褐色天然金刚石中存在籽晶金刚石。

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The diamond-encrusted disc symbolizes the natural abundance of the Bunder diamond deposit.

FORBES: Connect

James Diamond from Natural England said the money would help farmers managing the recovery of their fields.

BBC: From the section Somerset

With larger, synthetic gem quality diamonds coming into the market, investments in larger, natural, high quality diamond will become more attractive than ever.

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