I recently bought a diamond for my brother-in-law, intended for an Empire 2000E. As he didn't want to spend too much money on it for the moment, he went for a spherical for 2000. As the "smoke" diamond was out of stock, I was sent a diamond from the previous generation, and without a guard. This time, it was slightly too loose (although it had 2mm on each side of the square), I had to add a slight dot of glue that I dried, then scraped so that it fits and is held in the cartridge. But it was with a well-known seller on the Internet, who gave me this solution. Otherwise, he would have reimbursed me. It goes to show that it is necessary to buy from recognized shops on the Internet. Secondly, as a secondary market product, I always prefer Japan first, and only then, by far, Switzerland. I think that the Japanese do a better job than the Swiss, but that's a personal opinion.
So as far as the Chinese are concerned, I'll remain polite if you understand what I mean...