This imitation crystal is high quality (Grade AAA), K9 glass/crystal. It is very similar to a well known brand in look and quality, but more affordable. Add a splash of aqua blue to your jewelry designs with these 6 mm bicone imitation crystals! Whether you need 4, 20 or 50 pieces, these delightful light blue March birthstone beads are sure to add a fun, unique flair to any piece. Crystal clear brilliance and vibrancy! -6 x 6 mm -0.7 mm hole -Imitation Crystal Contains small parts. Not intended for children.