I highly recommend the purchase of a photo tent for sellers that sell jewelry or other merchandise where details really matter.  Jewelry and other detailed items can be very hard to sell if you can't really show their attributes.  I purchased one from a store on Ebay for less than $30 and it has definitely improved the quality of my pictures.  The tent I purchased came with four different backgrounds - black, white, blue and red.    They come in a variety of sizes, so you can use them for very small or large items.  This was definitely the best purchase I've made on Ebay as a seller.  Check the store out if you're interested:  studioforless.  They definitely offer a quality product with fast shipping!