"Canadian" diamonds are also a huge joke.
I can understand your point with a company such as Tiffany's, who direct buy and mix stones of multiple suppliers. Any retailer can say it is a Canadian stone, and how would a person really know?
However, the stones that are Canadian govt certified (and not direct supply), are mined, polished and cut without ever leaving the province. They are also fully documented and recorded through every stage and laser engraved with serial numbers. If you have supporting evidence that this is not the case, kindly educate us. If that is not guarantee enough, so be it.