Livingston Jewelers

Your Traditional Jeweler for the Future.

Determining Ring Blank Lengths

Use this table to determin the length of your Ring Blanks. The first table is a reference to American ring blank sizes in millimeters. So you may need to refer to the tables on the Determining Metal Gauges page first to convert from B. & S. Guage to metric.

Remember, when the metal is bent into a ring shape that the thickness of the metal will affect the length. That is why I am sharing this information. If you have a metal that is between two of the widths in this table, choose the column with the thicker metal and file the end a bit. This fall under the headding of "It is easier to remove a small bit of unwanted metal than to add it"


Determining American Ring Blank Lengths in Millimeters
Sizes
(U.S.A.)
Length
(MM)
Metal Thickness in Millimeters
2.0 MM 1.6 MM 1.3 MM 1.0 MM 0.8 MM 0.6 MM 0.5 MM
1 39.0 45.5 44.2 43.0 42.1 41.5 40.9 40.5
1 1/4 39.6 46.2 44.6 43.6 42.7 42.1 41.5 41.1
1 1/2 40.2 46.9 45.2 44.3 43.3 42.7 42.1 41.8
1 3/4 40.8 47.7 45.8 44.9 44.0 43.3 42.7 42.4
2 41.5 48.0 46.5 45.5 44.6 44.0 43.3 43.0
2 1/4 42.1 48.7 47.1 46.2 45.2 44.6 44.0 43.6
2 1/2 42.7 49.3 47.7 46.8 45.8 45.2 44.6 44.3
2 3/4 43.3 49.9 48.4 47.4 46.5 45.8 45.2 44.9
3 44.0 50.6 49.0 48.0 47.1 46.5 45.8 45.6
3 1/4 44.6 51.2 49.6 48.7 47.7 47.1 46.5 46.2
3 1/2 45.2 51.8 50.2 49.3 48.4 47.7 47.1 46.8
3 3/4 45.9 52.4 50.9 49.9 49.0 48.4 47.7 47.4
4 46.5 53.1 51.5 50.6 49.6 49.0 48.3 48.0
4 1/4 47.1 53.7 52.1 51.2 50.2 49.6 49.0 48.7
4 1/2 47.8 54.3 52.8 51.8 50.9 50.2 49.6 49.3
4 3/4 48.4 55.0 53.4 52.4 51.5 50.9 50.2 49.9
5 49.0 55.6 54.0 53.1 52.1 51.5 50.9 50.6
5 1/4 49.6 56.2 54.6 53.7 52.8 52.1 51.5 51.2
5 1/2 50.3 56.8 55.3 54.3 53.4 52.7 52.1 51.8
5 3/4 50.9 57.5 55.9 55.0 54.0 53.4 52.8 52.4
6 51.5 58.1 56.5 55.6 54.6 54.0 53.4 53.1
6 1/4 52.2 58.7 57.1 56.2 55.3 54.6 54.0 53.7
6 1/2 52.8 59.3 57.8 56.8 55.9 55.3 54.6 54.3
6 3/4 53.4 60.0 58.4 57.5 56.5 55.9 55.3 55.0
7 54.0 60.6 59.0 58.1 57.1 56.5 55.9 55.6
7 1/4 54.7 61.2 59.7 58.7 57.8 57.1 56.5 56.2
7 1/2 55.3 61.9 60.3 59.3 58.4 57.8 57.1 56.8
7 3/4 55.9 62.5 60.9 60.0 59.0 58.4 57.8 57.5
8 56.6 63.1 61.5 60.6 59.7 59.0 58.4 58.1
8 1/4 57.2 63.7 62.2 61.2 60.3 59.7 59.0 58.7
8 1/2 57.8 64.4 62.8 61.9 60.9 60.3 59.7 59.3
8 3/4 58.4 65.0 63.4 62.5 61.5 60.9 60.3 60.0
9 59.1 65.6 64.1 63.1 62.2 61.5 60.9 60.6
9 1/4 59.7 66.3 64.7 63.7 62.8 62.2 61.5 61.2
9 1/2 60.3 66.9 65.3 64.4 63.4 62.8 62.2 61.9
9 3/4 60.9 67.5 65.9 65.0 64.1 63.4 62.8 62.5
10 61.6 68.1 66.6 65.6 64.7 64.1 63.4 63.1
10 1/4 62.2 68.8 67.2 66.3 65.3 64.7 64.1 63.7
10 1/2 62.8 69.4 67.8 66.9 65.9 65.3 64.7 64.4
10 3/4 63.5 70.0 68.5 67.5 66.6 65.9 65.3 65.0
11 64.1 70.7 69.1 68.1 67.2 66.6 65.9 65.6
11 1/4 64.7 71.3 69.7 68.8 67.8 67.2 66.6 66.3
11 1/2 65.3 71.9 70.3 69.4 68.5 67.8 67.2 66.9
11 3/4 66.0 72.5 71.0 70.0 69.1 68.5 67.8 67.5
12 66.6 73.2 71.6 70.7 69.7 69.1 68.5 68.1
12 1/4 67.2 73.8 72.2 71.3 70.3 69.7 69.1 68.8
12 1/2 67.9 74.4 72.8 71.9 71.0 70.3 69.7 69.4
12 3/4 68.5 75.0 73.5 72.5 71.6 71.0 70.3 70.0
13 69.1 75.7 74.1 73.2 72.2 71.6 71.0 70.7

There are many websites, jewelers books and manuals and jewelry suppy catologs that will have a table like this. Pulled from many differant sites, this should be accurate.
Formated so it follows accessability requirments for the internet.



If you have suggestions for adding to this page, or comments, please email me at the link in the footer below.