New Diamond Technology claims to have produced largest man-made gem.
Argyle Diamond Mine has worked with indigenous people for 10 years.
DDI to coordinate technical assistance function of Kimberley Process.
Exceptional tender results achieved as prices triple in 14 years.
Letšeng stone said to represent "robust demand" for valuable diamonds.
New automated system can run through 500 carats of stones at once.
Structural overhaul follows recent closure of New York office.
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