5 New Gemstone Display Trays & Inserts For Jewellery Showcases & Countertops. This is a new set of 5 gemstone display trays and inserts that contains removable clear plastic round jars. These will hold all of your loose stones, beads and coins. The trays are also stackable. Each gem jar comes with a insert pad inside and lid. Each insert has 50 gem jars. The inside diameter of each gem jar measures approximately 1" (25 mm). Each case measures approximately 14 3/4" x 8 1/4" x 1" (37 cm x 209 x 25 mm).