The gloves have indeed come off. In a recent article, Diamond Foundry has taken a shot at the entire natural diamond industry, specifically naming Tiffany & Company as well as all retail jewelers for selling Russian Diamonds: “Putin’s Diamonds”, as they call them.
There is no difference in rarity between a .50ct and a 2.00ct laboratory-grown synthetic diamond (in spite of what the sellers of synthetic diamonds will tell you). The cost to produce them is simply linear – time in the reactor = size of the cube. Period.