More diamonds being graded in the oversea GIA labs vs the US lab would be my first guess.
They have also been doing a lot of automation would be the second.
Actually my best guess is more grading done outside the US combined with more automation.
Natural diamond prices will rise. On top of India stopping rough imports, Russia has stopped exporting. What changed, what happened: 1. jewelers and wholesalers are stocking fewer natural diamonds and more man made dian=monds - even though prices on larger stones will continue to fall by...