We can turn a rough stone into a diamond.

我们可以把一块粗糙的石头变成钻石。

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Until last year, De Beers produced about 40 percent of the global rough stone supply, and Alrosa 25 percent.

直到去年，德比尔斯公司生产了全球原石供应中大约40%的量，而阿尔罗萨公司生产了25%。

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They are like a piece of jade that needs to be polished on a rough stone for luster to shine forth.

人事的艰难与琢磨就是一种考验，一块璞玉要有粗石来磨，才会发出耀眼的光芒。

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Tests of iGem showed that it could increase the value of a rough stone by as much as 23%.

ECONOMIST: MONITOR

Graff's wholesale business allows him to cut out the usual middlemen--the brokers, polishers and manufacturers who each take their slice as a rough stone moves up the jewelry chain.

FORBES: Magazine Article

Greenish-yellow light shimmered on the rough stone walls.

NEWYORKER: The Sanctuary