CHOOSE YOUR CRYSTAL THAT WILL BE EPOXIED AROUND THE INSIDE OF THE LIGHT SO THE LIGHT SHINES THROUGH THE CRYSTALS. CHOOSE ANY STONE YOUD LIKE, AMETHYST, C,EAR QUARTZ ,CITRINE WOULD SHINE THROUGH BETTER THAN LETSAY LAPIS LAZULI, BUT I CAN SPACW THE DARKER NO SEE THROUGH STONES SO IT WILL LOOK BEAUTIFUL. MAYBE PUT A LAYER OF CLEAR QUARTZ FIRST THEN THE DARK COLOR CRYSTALS ON TOP.