I especially like the frosted glass look of #4. It reminds me of a glass door of a jewelry shop.
Nice imagery that flows well with the navigation buttons.

#1 looks a bit too much like the Walt Disney castle, but I like it's design nevertheless.

#3 and #8 are nice, and have simplicity and class, and are not too busy or overpowering. Very inviting and accessible.

Some of the fonts in the other examples are just too hard to read, and distracting.

By the way, I really don't like the squared pieces. Feels like they don't flow with the image of jewelry, to me. Maybe it's just me.
I'd like to see #4 with another jewelry piece, maybe like the one in #7, strung out similarly to the squared bracelet-thingy.

Dale

Why, I’m afraid I can’t explain myself, sir, because I’m not myself, you know...
- Lewis Carroll