20 articles about jewelry. $8 per article, good English only

Need a good native English writer to write 20 articles (400-500 words) per article about jewelry. Each article need to be unique, must pass copyscape, can NOT generate from software, and must be SEO and human readable Each article has to be corresponded to specific SEO guidelines. Will provide topics and references. However, some research has to be done, all depending on your knowledge of jewelry, jewelry history, and gemstones. Willing to pay $8 per article, and will put millstone payment for the first 6 article. After reviewing the first 6 articles, if we are not happy with the work (you will have chance to rewrite them), we will terminate the project. Don’t see the point why we have to waste each other’s time. We are looking to hire a good writer on a long term basis. If the writing turns out well, we would like to have you work on more articles (about few articles per week), and also work on our jewelry description and jewelry education. Thank you. Kea