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A worker mounds an uncut diamond for division in a laser cutting machine at the Guangzhou Mickey Weinstock & Co Diamonds Manufacturing Ltd. diamond polishing factory in Shawan, Panyu District, Guangzhou, Guangdong Province, China on Monday, Jan. 24, 2011. China's share of global demand for diamonds is set to double as the country's economy expands more quickly than those of the world's biggest gem-buying nations, RBC Capital Markets said in October last year. Photographer: Forbes Conrad/Bloomberg via Getty Images

A worker mounds an uncut diamond for division in a laser cutting machine at the Guangzhou Mickey Weinstock & Co Diamonds Manufacturing Ltd. diamond polishing factory in Shawan, Panyu District, Guangzhou, Guangdong Province, China on Monday, Jan. 24, 2011. China's share of global demand for diamonds is set to double as the country's economy expands more quickly than those of the world's biggest gem-buying nations, RBC Capital Markets said in October last year. Photographer: Forbes Conrad/Bloomberg via Getty Images
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A worker measures a diamond at the Guangzhou Mickey Weinstock & Co. Diamonds Manufacturing Ltd. diamond polishing factory in Shawan, Panyu District, Guangzhou, China, on Monday, Jan. 24, 2011. China's share of global demand for diamonds is set to double as the country's economy expands more quickly than those of the world's biggest gem-buying nations, RBC Capital Markets said in October last year. Photographer: Forbes Conrad/Bloomberg via Getty Images

A worker measures a diamond at the Guangzhou Mickey Weinstock & Co. Diamonds Manufacturing Ltd. diamond polishing factory in Shawan, Panyu District, Guangzhou, China, on Monday, Jan. 24, 2011. China's share of global demand for diamonds is set to double as the country's economy expands more quickly than those of the world's biggest gem-buying nations, RBC Capital Markets said in October last year. Photographer: Forbes Conrad/Bloomberg via Getty Images
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Workers polish diamonds in one of two rooms of polishing benches at the Guangzhou Mickey Weinstock & Co. Diamonds Manufacturing Ltd. diamond polishing factory in Shawan, Panyu District, Guangzhou, China, on Monday, Jan. 24, 2011. China's share of global demand for diamonds is set to double as the country's economy expands more quickly than those of the world's biggest gem-buying nations, RBC Capital Markets said in October last year. Photographer: Forbes Conrad/Bloomberg via Getty Images

Workers polish diamonds in one of two rooms of polishing benches at the Guangzhou Mickey Weinstock & Co. Diamonds Manufacturing Ltd. diamond polishing factory in Shawan, Panyu District, Guangzhou, China, on Monday, Jan. 24, 2011. China's share of global demand for diamonds is set to double as the country's economy expands more quickly than those of the world's biggest gem-buying nations, RBC Capital Markets said in October last year. Photographer: Forbes Conrad/Bloomberg via Getty Images
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Workers inspect diamonds in the quality control room of the Guangzhou Mickey Weinstock & Co. Diamonds Manufacturing Ltd. diamond polishing factory in Shawan, Panyu District, Guangzhou, China, on Monday, Jan. 24, 2011. China's share of global demand for diamonds is set to double as the country's economy expands more quickly than those of the world's biggest gem-buying nations, RBC Capital Markets said in October last year. Photographer: Forbes Conrad/Bloomberg via Getty Images

Workers inspect diamonds in the quality control room of the Guangzhou Mickey Weinstock & Co. Diamonds Manufacturing Ltd. diamond polishing factory in Shawan, Panyu District, Guangzhou, China, on Monday, Jan. 24, 2011. China's share of global demand for diamonds is set to double as the country's economy expands more quickly than those of the world's biggest gem-buying nations, RBC Capital Markets said in October last year. Photographer: Forbes Conrad/Bloomberg via Getty Images
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An uncut diamond is selected from a collection of colorless and colored diamonds on a sorting table at DTC Botswana, a unit of De Beers, in Gaborone, Botswana, on Thursday, Oct. 25, 2012.De Beers, the biggest diamond producer by revenue, is moving the sorting and trading of rough stones to Botswana from London to secure access to the world's largest supplier of diamonds by value and challenge Antwerp's dominance as the world's biggest trading hub for rough diamonds. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

An uncut diamond is selected from a collection of colorless and colored diamonds on a sorting table at DTC Botswana, a unit of De Beers, in Gaborone, Botswana, on Thursday, Oct. 25, 2012.De Beers, the biggest diamond producer by revenue, is moving the sorting and trading of rough stones to Botswana from London to secure access to the world's largest supplier of diamonds by value and challenge Antwerp's dominance as the world's biggest trading hub for rough diamonds. Photographer: Chris Ratcliffe/Bloomberg via Getty Images
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