You need a shadow free "Photo Box", like this:
Photo box
Notice their jewelery sample photos in the listing.
This item will be closed by the time you see it, but I'm sure this seller keeps duplicates listed, so check their listings. I don't know this seller, it's only for an example. There are many types and size of this photo box sold by other sellers at various prices.
It's also time for you to invest in a digital camera. Something in the $200 range. I highly recommend Canon.