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Length of metal required for ring sizing


#1

Sarah,

I happened to find these charts on the net a while back that have
the inside crcumferences for ring sizes with international
measurements, so size “K” is represented. Don’t forget to account for
the thickness of the metal.

http://www.diamondhub.com/ring.htm

http://www.18carat.co.uk/ringsizes.html

You might want to ask permission from the website owner… He stated
" Other jewellers are welcome to use this chart. You may ask to copy
this chart provided you agree to attach an acknowledgment and
copyright notice to your copy -=A9 Lawrence Chard 1999 ".

Since I created a folder on my computer called “Jewelry Reference”,
I’ve gotten lazy about looking in books for

Hope it helps.
Jesse Kaufman
CAD-CAM Technology
Handcrafted Originality
860-519-0875

[Edited - Hanuman]

Lawrence Chard’s formulas:

Diameter = (British Size x .4) + 11.5; where A = 1, B = 2, Z = 26=

, etc.
Diameter = (American Size x 0.83) + 11.54
European Size = Circumference - 40
Diameter = (Japanese Size / 3) +12.67