Tiffany engagement rings are one of the few things that is hard to say without doubt if it is truly authentic by pictures alone. All Tiffany diamonds are laser inscribed on the diamond itself and the serial number corresponds to the number on the diamond certificate that comes with the ring. The serial number is very, very small and a special tool is needed to see it. The only way to know without doubt that the diamond is the original Tiffany diamond is to take it to the Tiffany store or send it yourself to New York. It takes about 4 weeks, maybe 3 if they aren't busy, to get a new evaluation. That being said, this doesn't mean that you shouldn't buy a ring on ebay, you can get a great deal this way and you won't have any issues getting a new evaluation even thought the original may have been issued to someone else. But if there is an issue, it does put you outside most sellers return polices. Make sure you use a credit card through paypal to pay for it just in case. The bands on the rings in the photo's look good but I can't tell you that the diamond is authentic because of this.