Tierrafino Stone is one of the most difficult plasters to work with. Unless you are an extremely experienced DIYer, it is wise to get a professional to do the job. To achieve a shiny result you need Tierrafino Stone, Tadelakt Soap and the right tools amongst which a polishing stone.
If you want to work with Stone yourself, you can find instructions for use, the substrate requirements, and other technical information in the product sheets for Tierrafino Stone (PDF) and Tierrafino Stone Soap (PDF). Other sheets are available under downloads.