Sales take time, I am fairly new selller, started my shop in march, and i haven't had more sales than you. August is typically slow for any industry too. Jewelry is the most competitive category on etsy!
May I suggest something that was suggested to me, do all your photos on white backgrounds. I was very against this at first, but busy background detract from your jewelry, and don't allow the buyer to exactly see what you are selling. You can do busy backgrounds for your other four photos, but use the white background for your thumbnail. It also makes your shop look very cohesive, and really helped mine since I have a range of jewelry styles.
Also tweek your tags and titles. Have you searched etsy yourself to see how relevant you are.
For example the listing below
http://www.etsy.com/listing/79468187/necklace-purple-sea-glass-handcrafted?ref=v1_other_1I would not include the tags anniversary or birthday. Yes, people go searching for birthday and anniversary present but I would be more likely to put in nautical jewelry if that is what I had in mind for a gift. Also tags like toggle clasp go into your materials not your main tags.
Do more reading and research! I am constantly trying to read more and learn more.