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Interesting info, so yeah, the Swarovski at the event is Josuke or whatever, but they are selling a crystal Crazy Diamond on their online shop.
Just from the screenshot doesn't give any reference to the number available other than each will have it's own individual serial number. It does say on the right though 完全受注限定生産, which means like "full order limited production", I'm not sure if this means that while the order window is limited, they will honor any orders received in that time.
Exciting times for anyone who always wanted a crystal at it's retail cost but never was lucky enough to get hold of one.