Tiffany 18K Gold Band

I have an 18K Tiffany Gold Band purchased a Tiffany in the Galleria. The band is a size 5. Here is the link from the tiffany site, http://www.tiffany.com/Shopping/Item.aspx?fromGrid=1&sku=GRP02218&mcat=148204&cid=287466&search_params=p+1-n+10000-c+287466-s+5-r+-t+-ni+1-x+-lr+-hr+-ri+-mi+-pp+7167+42&search=0&origin=browse&searchkeyword=&selectedsku=23579251 The ring is 100% authentic and I have the Tiffany box and pouch for it.