Any stone being set has to be placed in a piece of metal. I suppose that (not shown originally), it should or could be in a "mini-tube" setting. The tube for a small diamond can be shaped just for the project at hand. Once the stone has been set, it can be then carefully contoured to the shape of 'table-facet'. The result is a 'smooth to the touch' finish!
Hope this helps you!
Gerry! from my Toronto iPhone!