Normal ear piercings are 18 gauge.
14 gauge is 2 sizes bigger than what you would get your ears pierced with (18 gauge). It is the standard gauge for most piercings.
00 gauge is approximately 10 millimeters in diameter. It is commonly used for larger body piercings such as earlobes.
14 gauge
1.291 equals 16 Gauge.
piercings vary in gauge sizes
A 16 gauge or 14 gauge are the most common for lip piercings.
14 gauge is larger than 16 gauge. 14 gauge is 1.6mm (0.06") and 16 gauge is 1.29mm (0.05").
20gauge piercings are the smallest common size.
A 14 gauge needle is 1.6 millimeters across, it's the standard needle used for 80% of all body piercings by professional body piercers.
The longer you had jewellery in the piercings, and they have become seasoned piercings (over a year old) then the piercings can remain viable for several weeks (this also depends on the gauge the piercings were done at).
None, 23 gauge is used for injection medications and is too small for any type of piercing.