Even to us, it was obvious that buying an engagement ring at a warehouse store was not wise, and besides, everyone always ends up leaving Costco with a gross of macaroni dinners and two pounds of beef jerky, and a stomach ache from eating too much of their cheap pizza. OK, fine, I leave Costco that way, but that’s all irrelevant, because we decided the best place to buy diamonds was the Galleria Mall in Glendale, CA.