Elena,
I noticed that you only use European ring sizes. A size 12 in Europe is a size 6 in the United States. Shoppers from the U.S. who read the description of your rings will think that the rings are too big for them. You should include the U.S. ring size in each listing.
Here is a International Ring Size Conversion Chart on this website:
http://www.ringsizes.co/Some of the keywords you are using are okay but you should find more keywords to add to each listing.
Same advice I give everyone:
You can do much better with that will help your listings get more views from Relevancy searches if you use keywords that shoppers use in the listing titles and tags of your listings
To improve titles and tags so that they really make a difference in views and sales, do the following:
1. Brainstorm for keywords: ask family, friends, customers, team members etc for words they would use if they were searching for items like yours. If you need more ideas from more people, I highly recommend this free Facebook group that you can join and get help with keyword ideas from other Etsy group members: www.facebook.com/groups/TheJoyfulEntrepreneur/
2. Take the list of keyword ideas to Google Adwords Keyword Planner to see which of these keywords are used by shoppers. Google will show you how popular or not each keyword is and make more suggestions.
3. Find at least one targeted long tail keyword phrase and 2 or 3 general keyord phrases that are a good fit for each of your listings. An example of a long tail keyword phrase would be "long black bead necklace." An example of a general keyword phrase for the same listing would be "beaded necklace."
4. Come back to this team thread when you are done and let us see what you came up with for your listings.
5. This tutorial on our SEO Team gives step by step instructions for using Google Adwords Keyword Planner:
https://www.etsy.com/teams/11352/relevancy-and-seo-beginner-and-advanced/discuss/13988472You might have to create a Google ad as part of setting up an account. Pause the ad right away so that it never runs. You can then use the Keyword Planner as much as you like to research keywords. Google will never bill you for an ad that never runs. I have over 30 ads that have been paused for more than 5 years and use Keyword Planner almost daily.
Remember to come back and let us know what you found doing your keyword research.