[snip] Here are two sizing charts with two different values for a
British size "X" inside diameter.
http://www.niceice.com/ring_sizes.htm One has it at 0.830" and the
other at 0.841"
Interesting. I wonder is there a translation problem inherent in
going from US sizes to Brit sizes? Perhaps it’s better to ascertain
the actual diameter in mm for each and compare that. I use a
spreadsheet to calculate the diameter in mm for all the British sizes
- first assign a number sequence to each letter A-Z (A=1 etc) then:
11.6713 + 0.3937 x = mm diameter
According to this, British X = 21.12mm Translate that to inches.
Sorry I don’t have a source reference for my method, but Gary
Wooding wrote in rec.crafts.jewelry a similar formula:
rec.crafts.jewelry … If you want to use an approximate formula,
convert the UK letter size to a number (A=1, B=2, C=3 etc) and
substitute the number for E in the following: UK Size (inches) =
0.458 + 0.01552 * E As can be seen, the formula is not accurate
because there is no linear relationship, but its fairly close.
Auckland NEW ZEALAND