Photos.
There are so many jewelry items on Etsy that you really have to stand apart from everyone else to get noticed. You should have a cohesive look to your shop and your photos don't. Some are outdoors, some in, some really dark, some really bright... A lot of your photos are cropped too close. I would try to get the entire item in the shot so people can immediately see what it is. Also, I would remove the quarters from your shots, especially the first photos. Those will never be chosen for Treasury picks and international shoppers may not know what a quarter is and therefore have no comparison. I prefer to see some other object used to give size comparison. I don't sell jewelry so I don't have any other ideas that would help, but try looking on the front page or through the Browse category to see what gets picked for Treasuries and see what catches your eye first to get some ideas.
Hope that helps a little :)