Pandahall 20pcs 18mm Half Round Flat Back Clear Glass Dome Cabochons for Photo Pendant Craft Jewelry Making Size: about 18mm in diameter, 4.5mm(Range: 4~5mm) thick. Material: Glass; Color: Clear Usage: Cabochons; Shape: Half Round; Priced per 20 pcs Crystal clear glass cabochons magnify designs and patterns when placed on top of paper or fabric. Best used with earring, cuff link, ring.Best used with earring, cuff link, ring.