Please post an example (maybe lores).
The best approach to the task natuarlly depends on the image – is the chadow clearly differentiated from the object in color or luminance? If so Selection Tools like Magic Wand and Quick Selection Tool can be useful.
Are the objects in focus and sharp edged? Then maybe a Path is a better way to go.
Is the background uniform? Can one paint it in, does it need to be Clone Stamped etc.?
Another "shooting" tip is to arrange the subjects onto a background, that will be knocked ot, taking shadows, or reflections, with it. Then, place the Image of the subjects onto a "clean" background.
One might also explore the Adjust>Shadow & Highlight function, to brighten Shadows. Experiment a bit.
Good luck to the OP,
Select the object with Quick select, fine tune with refine Edge, copy to a new layer, fill the background layer with white. You can add a subtle shadow with layer styles if you wish.
I did this as a demonstration in a lighting workshop I ran a couple of years ago. It makes for a very clean image ideal for adverts.
BTW It was taken with on-camera-flash, by directing the strobe at a large white sheet of foam board placed above and behind the bracelet, and with a flag under the strobe to prevent light hitting the bracelet direct from the strobe.