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.
大公司阿遼沙壟斷了俄羅斯的鑽石生産，公司本部就在此地，該公司的粗鑽産量佔全世界産量的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這個在平時在平時每年出産的未加工鑽石量佔世界的四分之一的公司，11月的時候沒有賣出一顆鑽石，之前的幾個月也賣得很少。
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.
萊特森鑛是歷史上産量最高的鑽石鑛之一。目前全球20顆最大的原鑽中有四顆産自這裡，其中有三顆發現於本世紀。

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