Best adhesive for glueing stones?

[Chasingsharpness]

What adhesives are generally recommended when glueing stones together?

I am considering glueing a shapton rockstar to a glass backing, or potentially even glueing two shapton rockstar stones back to back to create a combo stone and provide some support for each other after some wear.

Any recommendations?

 

[Corradobrit1]

Anything for marble, granite or stone will work.

 

[gentiscid]

Silicone glue