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Body jewelry sizes express the thickness of an item of body jewelry, using one of several possible systems. ==Background== (詳細はbody piercing jewelry have an important common factor: the diameter of the part of the item of jewelry where it will rest in the piercing site. With the wearing of European-traditional kinds of earrings, that thickness is not an issue, because jewelry is made to use only thin wire for support, and the wearer need only have a narrow piercing hole to accommodate it. But with body jewelry, there is a wide variety of possible sizes, and wearers generally want jewelry that is the same size as their piercing site. Some wearers want increasingly larger sizes— namely, to deliberately stretch the hole. So that wearers can choose the size they want, there are standards for body jewelry sizes, used by jewelry makers and sellers. Generally, the system of gauge-and-inches is used: In gauge notation, jewelry less than ″ thick is ''typically'' measured in a system originally devised for measuring wire thickness. A gauge number denotes a thickness on a standardized scale which, for most purposes, starts at 20g (0.812 mm thick— often used for the posts for nose studs), and increases in thickness (as the gauge number ''decreases'') to 0g, then 00g, and rarely goes any further as these thicknesses come closer and closer to ″. From there, sizes of ″ and thicker are always specified in fractions of an inch. (But note that sizes ''thinner than'' ″ are also sometimes specified as fractions of an inch; see the Conversion Table to see how these interleave with gauges.) Even though the gauge system was originally meant for wire, it is now used regardless of whether an item of body jewelry is an actual wire, or is instead a wooden plug, a plastic ring, or any other material. The alternative to using the gauge-and-inches system is to specify the thickness in millimeters. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Body jewelry sizes」の詳細全文を読む スポンサード リンク
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