This is simply a difference in terminology and actually describes the same product. A jewel box or jewel case is a plastic box that has a snapped in tray for the CD and a hinge to allow the box to close to protect the contents. There are four tabs on the front pane that hold the folder or booklet. A tray card sits underneath the tray and is inserted before the tray itself is assembled in the jewel box. The tray has a hub in the center where the CD is snapped into place. Standard jewel box trays are most commonly black or clear, but do come in a wide variety of colors. There are many different types of jewel boxes however the regular jewel box is the standard for CD packaging in the industry.