ring size

File:Ring sizer measuring tool 4.jpg

Ring sizes can be measured physically by a paper, plastic, or metal ring sizer (as a gauge) or by measuring the inner diameter of a ring that already fits.

Ring sticks are tools used to measure the inner size of a ring, and are typically made from plastic, delrin, wood, aluminium, or of multiple materials. Digital ring sticks can be used for highly accurate measurements.

ISO 8653:2016 defines standard ring sizes in terms of the inner circumference of the ring measured in millimetres.{{Cite web|url=https://www.iso.org/standard/65408.html|title=ISO 8653:2016|website=ISO}} ISO sizes are used in Austria, France, Belgium, Scandinavia (Norway,{{Cite web |title=Ring and Bangle Size Charts {{!}} Norwegian Jewelry - Marketplace and Blog |url=https://norwegian.jewelry/pages/size-charts |access-date=2024-04-19 |website=Norwegian Jewelry |language=en}} Sweden, Denmark, Finland, Iceland), and other countries in Continental Europe.{{cite web | url=https://www.buchkosky.com/education/european_ring_size/ | title=European Ring Size Conversion - Buchkosky Jewelers }}{{Cite web |title=International Ring Size Conversion |url=https://www.larsonjewelers.com/pages/ring-size-conversion-chart |access-date=2024-04-19 |website=Larson Jewelers |language=en}}

File:Metal ring size set.jpg

Other ring size measurement systems are used in areas that do not use ISO 8653:2016.

In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with {{frac|1|4}} steps, where whole sizes differ by {{convert|0.032|in}} of internal diameter, equivalent to {{convert|{{#expr: 0.032*pi round 4}}|in}} of internal circumference. The relationship of this size ($s\_\{NA\}$) to ISO 8653:2016 circumference ($C\_\{ISO\}$) is $C\_\{ISO\}\; =\; 2.55\; \backslash times\; s\_\{NA\}\; +\; 36.5$, while the relationship to ISO 8653:2016 diameter ($d\_\{ISO\}$) is $d\_\{ISO\}\; =\; 0.8128\; \backslash times\; s\_\{NA\}\; +\; 11.63$.

The Circular of the Bureau of Standards{{cite report |author=S.W. Stratton, Director |date=Jan 24, 1921 |title=Circular of the Bureau of Standards, No 43., Jewelers' and Silversmiths' Weights and Measures |publisher=United States Department of Commerce |page=39 }} summarizes the situation with this system: "While there apparently is only one standard in use in the United States, in reality, because of the lack of specific dimensions and because of the errors introduced by the adoption of a common commercial article as a pattern, there are many, although similar, standards." The standards are generally consistent and remain so. There does not appear to have been any improvement in the standard since then.

In Ireland, the United Kingdom and Australia, ring sizes are specified using an alphabetical scale with half sizes. Originally in 1945, the divisions were based on the ring inside diameter in steps of {{convert|1/64|in|mm}}.British Standard 1283:1945 However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm.British Standard 6820:1987

In India, Japan and China, ring sizes are specified using a numerical scale with whole sizes that do not have a linear correlation with diameter or circumference.

Netherlands, Germany, and sometimes Argentina use a standard (referred to as the German System{{Cite web |last=Hahnefeld |first=Bjoern |date=February 19, 2021 |title=ringgroesse |url=https://www.goldene-zeiten.info/fileadmin/uploads/ringgroesse-ermitteln.pdf |url-status=live |archive-url=https://web.archive.org/web/20210510050645/https://www.goldene-zeiten.info/fileadmin/uploads/ringgroesse-ermitteln.pdf |archive-date=May 10, 2021 |access-date=February 12, 2023 |website=Goldene Zeiten Juweliere}}) where ring sizes are defined by the diameter of the ring, measured in mm.{{Cite web |title=Determine ring size |url=https://lepaul.amsterdam/pages/determine-ring-size |access-date=2024-04-19 |website=Le.Paul Jewelgarden |language=en}}{{Cite web |title=How to measure your ring size |url=https://www.taj.nl/en/service/ringmaat-meten/?source=facebook |access-date=2024-04-19 |website=Taj Amsterdam |language=en}} This system may also be used at times in Russia.

In Italy, Spain, and Switzerland, ring sizes are specified as the circumference minus 40 mm: for example, size 10 in this system is equivalent to ISO 8653:2016 size 50.{{Cite web|url=https://meinrubin.de/ringweite-messen/|title=Ring size measurement|date=21 November 2022|language=de|author=Juwelier Limburg}} This may also be referred to as the Swiss Ring Size System.

In Russia, ring sizes are equal to the inner diameter rounded to whole and half numbers, sometimes to quarters, for example diameter 16.92 mm is equal to size 17, 16.1 mm is equal to size 16.

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Most rings can be resized; the method of doing so depends on the complexity of the ring and its material. Rings of soft material may be enlarged using mechanical stretching. For example, the ring may be enlarged using a rolling mill, a steel ring mandrel, or a Schwann Ring Stretcher.

In some cases, the ring may need to be cut open and material either added or removed before fusing the ring together again. The ring may be slightly heated to reveal any solder line so the jeweler can open the ring on the same seam so as to minimize the total number of solder joins on the ring.{{cite news | url=https://www.ganoksin.com/article/different-methods-how-to-resize-rings/ | title=Different Methods on How to Resize Rings - Ganoksin Community | newspaper=Ganoksin }}

Small metal beads called sizing beads can be added to the inner circumference of a ring to:

• Decrease the effective inner diameter of a ring that is too big, to aid in holding the ring in place against the finger
• Counterbalance top-heavy rings
• Keep a ring from spinning for wearers whose knuckles are much larger than their finger base[https://serengetiwest.com/do-i-need-ring-sizing-beads/ Do I Need Ring Sizing Beads? | Serengeti West Fine Jewelers]

Sizing beads are typically made of the same metal as the rest of the ring since it is easier to solder two similar metals.

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Category:Rings (jewellery)

Category:Sizes in clothing