The 4 Cs are the characteristics that determine a diamond's value: cut, clarity, colour and carat (weight).
Larger stones of a carat to three carat still come largely from Israel and Antwerp, and the proportion of Indians selling such stones, though growing, is still small.
Speaking in an interview in Lusaka yesterday, she said Zambian gemstones were fetching five dollars per carat , equivalent of five grammes, on the West African market.
Most people cannot tell the difference between a ruby and a garnet, which is worth considerably less carat for carat .
Proud inheritor of the magnificent De Beers diamond, at 234.5 metric carats , one of the world's largest, he got Cartier of Paris to create a spectacular five-stringed necklace shaped like a bib to showcase it.
While India processes 120 million carats of diamonds a year, China, on the other hand, does 2.4 million carats which translated into diamond sales is $740 million.
However, one does not need to be an expert on the Hope Diamond to know that its correct weight is 45.52 carats , a weight that has been accurately reported in reputable scholarly publications for most of the latter half of the last century.
The star lot is a large solitaire diamond weighing 4.50 carats .
Within the gem trade, however, especially among those who deal with diamonds, it is one of the ever-cute 4 Cs: color, clarity, cut, and carats , or carat weight.
Good brown macle twins up to several carats in weight have been available in recent years from the Udachnaya mine.