I had a concrete walkway installed. To give it more color, we embedded 18"-20" round, flat garden stones with glass designs on top. Over the years, the glass came out. So, we chiselled out the stone and bought another to replace it. In the process, the new stone is not quite level with the walkway and I was wondering about the preference for using stone dust or sand between the concrete base and the stone as a leveller and around the new stone. Also, I was curious if there was any special trick to using it or campacting it. It is a very small project, but I was hoping for advice.

Thank you.