how to make plaster of paris molds for casting silver jewelery
A lot depends on your design, the material of the model and such. If you are asking how, then does it mean you have little experience in making any molds at all? Anyhow, a traditional method, I am told, is to use plaster=one part to asbestos=one part. But please note that I am not recommending asbestos. This dangerous material is used as a binder in this formula.
you can use clay or wax to make your desighns and put plaster on them the when dry remove the clay or wax and you have your moulds