Overfilling the gem-chamber
During production we realized that the ceiling of the gem chamber was a delicate part of the bottle. And in the end we enforced the glass by making it 3mm thicker. But even so, please make sure never to overfill the gem-chamber. Forcing the bottom lid shut will cause the wall between the two compartments to shatter.
Be mindful when you insert the crystals. We recommend using the technique where you tilt the bottle and gently place in the gemstones one by one.
Dropping the gemstones in the chamber keeping the bottle completely upside-down might break the glass.