Product on white photography is at its best when jewelry is the object.  The gorgeous reflective surfaces create light magic on their own.  Adding photographic lighting which is then manipulated to capture the most interesting reflection is the fun part.  Every nuance of the camera changes the drama. That also makes it one of the most challenging product photography sessions.  So many choices!

…and waiting until the necklace stops swinging!
Canon 5D Mark III
Canon Macro Lens EF100mm f/2.8
Softbox with gradient
Rotolight
Back lit