Another good tip is being more “themed” with Jewellery e.g. if a bird item; ensure to have different species as keywords; dove, hummingbird, swallow etc. I find that sort of product tends to sell better than classic, simple Jewellery - such as a necklace with a plain square gemstone for the pendant (because there’s so much of that stuff and they are hard to distinguish with a specific keyword - making it harder to find them).

For your bird necklace above, you don’t have the word “Bird” or species “Sparrow” in the title - but I would say that’s the most important thing. I would keep it simple.

Suggested title:

(Brand name if required), Sparrow Bird Necklace, Sterling Silver with Amber Pendant

That’s what I personally would put if it was my product anyway. Good luck. Let me know if it works! Note that if the listings have been there for months then they will have already been seen as non-sellers in terms of organic results - meaning they probably will not be easy for a customer to find even with a better title. Ask Amazon if they don’t mind you deleting the listing and starting again may be…?

Finally, once you get a few sales, your listings will show the proper “buy box” which will also then boost sales a little further.

It’s better for me to translate products on http://www.anka-schmuck.de/ and http://www.anka-jewellery.com/ - invest in better products description on my websites vs helping amazon to improve their SEO … right?

It’s also huge ingnorance from amazon that they are not taking part on that forum, not listening customers who are selling products. Maybe their strategy is exacly as you said: force the lower prices to let them take over the business and start selling without sellers like me or you.