Hmm- I'd perhaps add the disc shape in there as well as a few other bits and pieces. I notice your tags are single words- here are some I might try:
summer jewellery (or jewelry)
spring jewellery
pastel colours
pastel jewellery
disc necklace
peach necklace
thread jewellery
embroidery thread
embroidery necklace
blue necklace
green necklace
blue thread
peach thread
green thread
Repeat tags in the title and the first part of the description to increase that relevancy too! That might include the summer jewellery bit.
If it were my item, I might remove silver plated and add it to the materials instead. I'm not sure I've ever had a hit from 'silver plated' in any of my jewellery items before. That's not to say that you won't, but I would keep that tag slot open for something else! Also, don't forget to put some hyperlinks in those three listings pointing to the others in the set- back links are really helpful to keep people in your shop!
My search rating is pretty rubbish at the moment, but I hope you can get some decent hits with those tips- I hope they help! The photos look great, and they certainly look very summery!
