New Gem Jar Insert Pad For Jewelry Displays & Countertops. This is a new white gemstone jar insert. This insert contains 16 removable clear plastic round jars. This will hold all of your loose stones, beads and coins. Each gem jar comes with a white insert pad inside and lid. The inside diameter of each gem jar measures approximately 1 3/8" (35 mm). This display pad measures approximately 7 3/4" x 7" x 3/4" (196 x 178 x 19 mm).