I just got this necklace as a gift but the heart is sooooo big!!! and I went to the local Tiffany's to see if they had the smaller one, and she showed me the mini, but theres such a huge size difference between the mini and the one I have now. And the girl kept telling me no no no, thats the next size up. But they had an 18k gold one that was in between both sizes of the sterling silver........ does anyone know why this is?????? I really think she was wrong, but i'm not sure!!! I want a smaller heart, but the mini is too small.... will I just have to live w/the bigger one??????