TPF may earn a commission from merchant affiliate
links, including eBay, Amazon, and others
first of all, your wife is a lucky woman. Ok, let's talk jewelry. Both pieces are beautiful and you can't go wrong with either one. If she likes fancier designs, go with the left one. I personally prefer the one on the right as i like the more classic tiffany pieces. Both would look great on a 20 inch chain.
I personally prefer the one on the right as I like the more classic Tiffany pieces.
+1It's also important to note that the keys are of different sizes, which may be an important point to consider over the general design differences.
The one on the left is more of a statement piece that looks great on a long chain over a black top. In contrast, the one on the right looks best on a shorter chain.
Google images of these two pieces being worn to figure out which one she'd make the most use of, given her personal style.