OP, I forgot to add that there was another lady on this forum who has very strong feelings about getting a Tiffany IDEAL diamond (she used the online calculator as well). She was the one who I learned about this ideal diamond thing from and she was very helpful. I think she has a 2 carat Tiffany diamond and she said it took her months before she found this ideal diamond. She said her SA showed her many diamonds and she requested to have the certificates in the store so she can calculate the # before the fiance bought it. If you really care, I would say you get an exchange for an ideal diamond.