diamond in the rough

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The corporate giant Alrosa, which owns Russia's diamond monopoly, is based in the region and accounts for 20 per cent of the world's supply of rough diamonds.
大公司阿辽沙垄断了俄罗斯的钻石生产，公司本部就在此地，该公司的粗钻产量占全世界产量的20%。
Debswana normally supplies almost a quarter of the world’s rough diamonds annually but sold no stones in November and few in the months since. (Photo: AP Photo / Obed Zilwa)
Debswana这个在平时在平时每年出产的未加工钻石量占世界的四分之一的公司，11月的时候没有卖出一颗钻石，之前的几个月也卖得很少。
Letseng is one of the most productive mines in history -- four of the world's 20 largest rough diamonds have been found at the mine, including the three largest found this century.
莱特森矿是历史上产量最高的钻石矿之一。目前全球20颗最大的原钻中有四颗产自这里，其中有三颗发现于本世纪。

Detroit Piston scout Will Robinson, who found future All-Stars Joe Dumars and Dennis Rodman when they were diamonds in the rough.
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In an article that hit TheStreet Monday, I made a case against low-priced stocks, noting that potential diamonds in the rough exist.
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Neither school is known for being football factories, and as such, significant credit must be paid to the Ravens and 49ers staffs for finding these diamonds in the rough.
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a person who is kinder and more pleasant than they seem to be from their appearance and manner