IMO, if I am your customer, I would like the neat and easy navigation style. I do not get why you put Ears, Fingers, Necks ,etc. until I saw the words 'Beutify my' on the top right corner of the navigation box. It loads real fast. I like the check out system where I don't have to sign up and then verify my email,etc. because I hate signing up process while buying from online websites. You put all info at the same page as your term, it would have been easier for me to find it if you can make another page for payment/shipping info. Your rings come with sizes, it would be helpful too if I can have a size chart for comparison. You do accept Paypal so if I am a customer that will buy the product, I will feel very easy and comfortable to purchase on your website. That's what I think of it. Great collections tho.
I do agree about the background color. A soft color like white, light pink or light colors will make it looks better. Instead of a witch, why not an angel with an tinkerbell?
You need way more detail on the pictures. Close-up shots and multiple angle shots. You'll be hard-pressed to find someone willing to shell out 250 plus pounds for a piece of jewelry without getting close-up shots. This can be accomplished by using a light-box effect. Check out http://www.pictureframeguys.com/search_frames.php?basic_type=Wood for an idea. If you click on a picture, you get close-ups. This is more effective I think. Once at a specific piece of jewelry, I tried to go back to the homepage (by clicking the icon in the upper left). This was very slooooooow. These are my thoughts.