The actual glass measures 31mm across at widest point & is 31mm long.
Care instructions: Whilst each piece goes through an annealing process to strengthen the glass, do take care not to drop them. The sterling silver bail is easily cleaned with a polishing cloth and recommended that you wipe over the metal after wear to stop tarnishing.
NB. Glass is notoriously difficult to photograph, most pieces appear more vibrant and full of life to what the camera can capture, whilst every effort is made to take a true photograph there may be minor differences.