Body Jewelry Size Charts work well when sizing metal body jewelry (Steel, gold, titanium, etc.). Remember that Body Jewelry Size Charts for Organic and Acrylic materials (Glass, bone, wood, stone) the size of the actual jewelry may very slightly. Most of the time the size difference is not even noticed. The Body Jewelry Size Chart below, lists the most common of points that are measured on different styles of body jewelry.

• Barbells – the shaft is measured in “length” between both balls, how thick the shaft is the “gauge“.
• Labret Studs – the shaft is measured in “length” between the end and the ball, how thick the shaft is the “gauge“
• Circular Barbells – the bar is measured in “Diameter” between the inside opening of the jewelry, how thick the bar is the “gauge“.
• Captive Bead Ring – the bar is measured in “Diameter” between the inside opening of the jewelry, how thick the bar  is the “gauge“.
• Bent Barbells – the shaft is measured in “length” between both balls, how thick the shaft is the “gauge“.

• Nose Screws – the shaft is measured in “length” between the bend and the top end, how thick the shaft is the “gauge“.
• Plugs – the shaft is measured in “length” from end to end, the space between the lip or ridges if there is one (or two) is called “Useable Space” or “Saddle“, how thick the shaft is even if it is hollow is the “gauge“.

Thanks to piercings.net for use of their info & graphics!