In studio, photographers have full control of the subjects, the lighting and of the environment. Nothing is left to chance.
You have to know the physical rules of reflection, refraction and diffusion. You have to know how an object react to lighting: some are transparent, other are glossy or matte. You have to know how to modify the light. It is very technical and my study in physics are really helpful.
All the photos shown here were obtained directly in camera with as little as possible post-production: curve adjustments, saturation and clone cleaning, nothing else.