Be aware that a printed “cut out of paper ring sizer” such as on this picture below is not reliable! 
Good to know: the difference in diameter between one size to another is less than 1/3 mm. = 0.32 mm. Check sizing by your local jeweler. It is safest!

Measure your ring size in seconds
ring size chart for male and female 
free paper printable online ring sizer
Measure the exact ring size with this Precision Ring Size Chart: Consult the user manual Ring size measurements for USA, Europe, UK, British, Britain, Japan and international, offered for free by 
Ajediam your Trusty Diamond Company in Antwerp World Diamond Center.
Did you mean: Diamond size chart  
ring size: Europe 42 or 2 - USA: 1.5 - UK: A - Japan: 2 - Diameter 13.37 millimeter image
ring size: Europe 43 or 3 - USA 2.0 - British B - Japan 3 Diameter 13.689  millimeter image
ring size: Europe 44 or 4 - USA 2.5 - Britain C - Japan 4 - Diameter 14.007 in millimeter image
ring size: Europe 45 or 5 - USA 3.0 - Britain D - Japan 5 - Diameter 14.326 in millimeter image
Europe ring size 46 or 6 - USA 3.5 - UK E - Japan 6 = 14.644 millimeter diameter
USA ring size 4.0 - British F - Japan 7 - European ring size 47 or 7 = 14.963 millimeter diameter
Europe ring size 48 or 8 - USA 4.5 - Britain G - Japan 8 = diameter 15.281 in millimeter
Europe ring size 49 or 9 - USA 5.0 - British H - Japan 9 = diameter 15.6 millimeter
British ring size I - Europe 50 or 10 - USA 5.5 - Japan 10 diameter 15.918 in millimeter
Japan ring size 11 - Europe ring size 51 or 11 - USA 6.0 - British J = 16.236 diameter in millimeter
Europe ring size 52 or 12 - USA 6.5 - British K - Japan 12 diameter: 16.554 millimeter
European ring size 53 or 13 - USA 7.0 - British l - Japan 13 - 16.873 millimeter diameter
Europe ring size 54 or 14 - USA 7.5 - British M - Japan 14 = 17.191 millimeter diameter
USA ring size 8.0 - European ring size 55 or 15 - British N - Japan 15 - 17.509 millimeter diameter
Europe ring size 56 or 16 - USA 8.5 - British O - Japan 16 = 17.828 millimeter diameter
Europe 57 or 17 - USA 9.0 - British P - Japan 17 - 18.146 millimeter diameter
Europe 58 or 18 - USA 9.5 - British Q - Japan 18 = 18.465 in millimeter diameter
Europe 59 or 19 - USA 10.0 - British R - Japan 19 - 17.783 millimeter diameter
Europe 60 or 20 - USA 10.5 - British S - Japan 20 = 19.101 millimeter diameter
Europe 61 or 21 - USA 11.0 - British T - Japan 21  = 19.42 millimeter diameter
Europe 62 or 22 - USA 11.5 - British U - Japan 22 – Circumference: 19.738 millimeter diameter
Europe 63 or 23 - USA 12.0 - British V - Japan 23 = 20.056 millimeter diameter
Europe 64 or 24 - USA 12.5 - British W - Japan 24 : 20.375 millimeter diameter
Europe 65 or 25 - USA 13.0 - British X - Japan 25 = 20.693 millimetre diameter
Europe 66 or 26 - USA 13.5 - British Y - Japan 26 : 21.011 millimeter diameter
Europe 67 or 27 - USA 14.0 - British Z - Japan 27 : 21.33 millimeter diameter
Europe 68 or 28 - USA 14.5 - British Z+1 - Japan 28 : 21.648 millimeter diameter
Europe 69 or 29 - USA 15.0 - British Z+2 - Japan 29 = 21.966 millimeter diameter
Europe 70 or 30 - USA 15.5 - British Z+3 - Japan 30 = 22.285 millimeter diameter
Europe71 or 31 - USA 16.0 - British Z+4 - Japan 31 = 22.603 millimeter diameter
Europe 72 or 32 - USA 16.5 - British Z+5 - Japan 32 = 22.921 millimeter diameter
Europe 73 or 33 - USA 17.0 - British Z+6 - Japan 33 = 23.24 millimeter diameter
Europe 74 or 34 - USA 18.0 - British Z+7 - Japan 34 = 23.558 millimeter diameter
Europe 75 or 35 - USA: 19.0 - British: Z+8 - Japanese: 35 =: 23.877 millimeter diameter
Ring size user manual
and tips:

To measure ring size adapted to your finger size print this free universal Ring Size Chart

Approximate exact visual and printed ring size chart by screen size 1280 x 800 pixels!

Put a ring that fits on your finger over the printed ring gauge and measure the inside of your ring with the outside of the printed size. When it match together than you have found your ring size.

TIPS
Measure the exact ring size in the right conditions: 
At noon - Midday is the most frequent temperature and moisture of your region. *Fingers will swell more in the evening than in the morning. They will also be thicker in summer than in winter. Heat makes fingers thicker. Cold makes fingers thinner.

*Be sure! The difference in diameter between one size and another is less than 0,32 mm.! 
The wrong measurement can cause easily the loss of your precious ring or, when the ring is to small, it hurt or you cannot put the ring on your finger!
View also to the ring size converter on next page for USA, Europe, UK - Britain, Japanese, International Conversion of ring size into diameter, Legend: (42) = Circumference in millimeter: outside drawing = inside of your ring -- (13,37 mm.): diameter outside of drawing = inside ring.  View sizes in Inches - Convert mm. in Inch  
Inside of ring must match outside drawing

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Do you have a personal ring in mind? Email me
ring sizer to cut out of paper is not reliable
How to measure the size of a mounted diamond in settings, rings and jewelry:
Diamond sizes for loose diamonds
When a diamond is fixed in a ring or setting you can estimate the diameter between the prongs on opposite sides of a stone
With a professional measuring tool, gauge estimator or a brass calipers 
you will find the size / dimensions of set / mounted diamonds, the inside and outside diameter, depth + thickness.
brass callipers image
Leveridge to measure the size of set diamonds image
The diamond size is the key to estimate the carat weight of diamonds.
To estimate the diameter in a closed setting and the carat weight of 
ancy shaped diamonds we advice to go to a professional jeweler.
Leveridge, tool to measure 
the size of set diamonds
Brass callipers instrument 
to measure the size of set diamonds
You can buy it at about +- US $ 7
at www.stantonbooks.com
or you have it already in your toolbox
 Email     Tel: +32 3 233 29 90 
Antwerp World Diamond Center, Diamond Exchange, Hoveniersstraat 2, Antwerp / Belgium / Europe
This page was last updated on: March 23, 2015
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