Hi NicRic,
Welcome to the Q&A Board.
You will have to edit your images a bit; most digital images need to be reduced in size, sharpened and perhaps cropped.
The first thing you really will need is a tripod. I don't know if you live in the U.S. but I bought a lightweight tripod for less than $20 at Walmart (MX 1000) and it is perfect for most of my needs. I also have a mini-tripod that I bought through Amazon (QSX Mini Pro Plus). If you buy a mini-tripod to take photos of jewelry, make sure it is a sturdy one and that you can tilt and turn it.
I am not a professional photographer, so I can't offer you any pro techniques for photographing jewelry. But I have taken some shots of jewerly for a client, who was very happy with the results. You can see some of them here:
http://bykari.com/gallery/index.htmWhat I did was set up a little bench under a porch when the lighting was bright. Because the jewelry was not in direct sunlight, but ambient outside light, there were no harsh shadows. I set my digital camera on a tripod and moved it close to the subject, set it to macro mode and used the self-timer to trigger the shutter-release button.
I used a light colored background. If I remember correctly, I used white paper. I did resize, crop and sharpen each image. For a few images I used the clone tool to eliminate any unwanted spots or creases which showed in the background.
Like I said, this isn't the way pros would go about it. They use special lighting, have special boxes in which to place the jewelry, etc. I just don't have enough need to spend money for that type of equipment.
Hope this helps a little bit. If you have additional questions, please let me know.