On a whim ( a rather stupid one at that) I bought five ruby briolettes and I am now stuck as to how to set them. Having researched a little it seems my only option as they are undrilled is to set them with conical caps and glue, and would it be Devcon glue I should be looking at to buy?. They are only small 5.8 x 3.5/3.5mm.

I do not think I can drill them considering their hardness and the awkwardness of the shape for holding while drilling.