Your necklaces are beautiful and congratulations on already having a sale for being such a new shop!
The biggest thing that I can see that might need some adjusting is the photos. Some of the backgrounds are a little distracting and the hard shadow makes it a little difficult for the beauty of the necklace to really stand out. I would suggest getting as close to a bright window as possible (but one without direct sunlight) and turning off the flash. Product photography can be a real challenge, but keep working at it an experiment a lot with angles, lighting and backgrounds. The main goal you want for your photos is for your items to really stand out. Also, be sure to use the best photo you have for the main listing photo (like for the berry necklace, I would use the second photo you have rather than the one shown) And avoid using 2 photos that are nearly identical. Showing the different angels is great, though!
I'm not a huge jewelry purchaser, but prices look good to me. :)