Photo ideas & inspiration
An interactive demonstration

For example, bridal magazines, often display diamond rings on soft, romantic looking backgrounds. These images are often two or more images combined.  The diamond photo original  "background is removed" using Photoshop or a similar program. Then a "new background" is selected to replace the original.

The benefits of combining multiple images are many. A diamond requires "close-up" macro photography. But even lush, smooth fabrics such as silk will appear noisy shot using a macro lens. The benefit of shooting the background separately in this case, is that you can shoot it from a distance, and use a different scale to help eliminate noise, and keep the smooth appearance.