Bergeon ring gauge

Jewelry Discussion
1

I have recently been given a Bergeon Ring Gauge and have been asked
to size rings using the gauge (european sizes 41-78). I have no idea
of how to determine how much metal to cut off when reducing sizes,
for example from 51 to 49. Please help! Thank you in advance.

2

European sizes define the inner length of the band, ie. if you
(mentally) unroll the ring, it’s lenght would be, in your example, 51
millimeters (mm).

To reduce the size from 51 to 49, you would have to reduce the inner
circumference by 2 mm or 0.08 inch. (1 millimeter = 0.0393700787
inch).

Andreas

3

It really couldn’t be easier. European ring sizes refer to the
internal circumference of the ring in millimetres. So, to change a
size 51 to a size 49 you just remove 51-49 = 2mm.

Regards, Gary Wooding

4 
I have recently been given a Bergeon Ring Gauge and have been
asked to size rings using the gauge (european sizes 41-78). I have

http://www.original-diamonds.com/jewelry_ring.php
http://www.onlineconversion.com/ring_size.htm

Handy sites…

5

The numbers on the ring gauge correspond to the length in
millimeters of metal needed to make that size ring. One must then add
to this number the thickness of the metal being used. Every size
change is one millimeter. To go from size 51 to size 49 you must
remove 2 millimeters.

Lois Martens