My two cents....
First, it takes offering an item people want. Your prices seem pretty high for stones that are not especially sought after.
Second, you most expensive stone, I looked at it. It's not polished very nice at all. There are sanding/cutting marks all over the facets of the stone, Why would someone want one that looks like that? It looks like you did an ok job cutting it, but you did not polish it very well at all. That will drop the appeal to any buyer who might want one of your stones to set in a ring of their own.
Third, you are outside the US. Many buyers are leery of buying from sellers outside the US, especially when it comes to precious or valuable items. You are going to need to offer an outstanding product at a really good price to get much interest and get people willing to take a chance on it.
