Sapphire and ruby expand when heated please note that not all quartz nails are exactly the same internal diameter. There must be at least 1mm of space in between the insert and the wall of the quartz nail or the quartz and/or insert WILL break.
- 19mm insert requires a quartz banger with a minimum internal diameter of 20mm from top to bottom. 22mm insert requires a 23mm internal diameter from top to bottom.
Know your quartz internal diameter before use!