In fact, dating back to 2006, Zhecheng county established an industrial park with support infrastructure to focus on the ...

Several years earlier, Asscher had successfully cleaved and polished the Excelsior diamond, a 971-carat rough that was at the ... are sized to a microscopic 50 microns (five hundredths of a ...

Data for global annual rough diamond production (both carat weight and value) from 1870 to 2005 were compiled and analyzed. Production statistics over this period are given for 27 diamond-producing ...

Rough diamonds, fit for cutting, are sold at 41 13s. 4d., to 42 the carat. A carat is rather more than three grains, and 156 carats equal to one ounce Troy. But if the stones ' are above one carat ...

Canada’s Lucara Diamond has announced the recovery of a 1,094-carat rough diamond from its Karowe Mine in Botswana. The company noted that this find is the second of such magnitude this year ...

Diamonds and other gemstones are weighed in metric carats: one carat is equal to 0.2 grams, about the same weight as a paperclip. (Don’t confuse carat with karat, as in “18K gold,” which refers to ...