Yes, I noticed that too. I spoke with the seller and she repped it as 3.5, but for the life of me it looks like the classic option is closer to 4. It actually could be, as the owner said that the classic one was mis-priced by her daughter on the website (she lets her upload them to give her something to do) so it's possible that she mis-labled the diameter as well. I guess relevant information is also that the traditional option is less than half the price of the tourmaline one (the seller volunteered that she'd give it for me for the mis-price). Both are within my budget for what I'm willing to pay for a crystal sphere though, so I'm not factoring that in too much. I have been leaning a bit in the classic direction though, just because it's closest to a traditional crystal ball, but has more going on than the glass sphere props we're used to seeing in the movies and such.