Best glue to fix semi-precious stones to glass?

i would use E6000 glue

The stones are beautiful. I checked with a site that is good at suggesting the types of glue to use various items. This is is what came up

Ceramic to Glass

For the strongest, fastest, and most invisible bond we recommend:

Loctite 349 Impruv

If Loctite is not available in your area, or you live in Alaska in the winter where there is no available UV light, we recommend:

General Electric Silicone II

For a less toxic option, but not nearly as strong, we recommend:

Weldbond

Whenever you are gluing glass you must consider the visibility of the adhesive. If the glass is translucent or transparent, you will want a glue that dries as clear as possible.

Before gluing any glass bond be sure that the glass is clean, free of any oil (even from your fingers) and dry.

Araldite (epoxy resin).

Its a 2 part formula, you mix them together with a spatula and apply it to the surface of the object you want to stick things to. You can get it in these cool syringes for precision applications. Its fairly affordable from most DIY shops and is nice and strong. Pretty messy and difficult to remove once dry so be careful with it. Also I would go for the rapid variety as the other one takes 40 minutes to be touch dry and before that the stuff you try to stick slides everywhere!

Super glue.

Clear Epoxy Resin,should do the job.