Apparently, as reported by Time Magazine in September 2012, Russia is home to a location in Siberia where a meteorite struck the earth about 35 million years ago. This action created impact diamonds, which are best used as industrial diamonds.
From the Geology Web site:
"This flash formation converted flakes of graphite in the Archeangraphite-garnet gneiss into diamond. Many of the diamonds produced were small polycrystalline stones that are approximately the same size and shape as the graphite flakes in the gneiss. Most are tiny stones under 2.0 millimeters in size that might be suitable for producing diamond abrasives."
This will have little if any impact on the gem-quality diamond market.
Oil Reserves are big and oil deposits are small.
No one seems to know for sure, but Namibia, Angola and Cameroon, as well as Russia, all have massive reserves, still untapped.
The Diamond as Big as the Ritz was created in 1922.
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A diamond mineral reserve is a geological phenomenon made up of at least one volcanic pipe that erupts diamonds and other precious minerals to the earth's surface. Many have been discovered in several countries in Africa, Canada, Australia, Brazil and India. Undoubtedly, there are diamond mineral reserves that have not yet been discovered on earth.
South Africa had relatively huge reserves of gold and diamond
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If the diamond is an ideal emerald cut with these measurements, the diamond may weigh about one quarter of a carat. Otherwise, you have stated the diamond's 'big' size in measurements.