There isn't really a recommended glue for jewellery, because traditionally gem stones are set by capturing them with metal.

However two part epoxy resins, of which Araldite is one, are sometimes used for their reliability and water resistance. It's best to chose one that sets completely clear.

Some members recommend gel cyanoacrylate, or superglue, which sets very fast and is less easy to manage.

Glues affect the brilliance of translucent stones and are quite difficult to apply so as to remain invisible.

The adhesion can be undone by heating, or with solvents, provided the stones can be prised out before they become damaged. Dennis.