How to Guide on Diamond Jewelry Sizing

This guide is going to provide information on typical sizing of rings, necklaces, and bracelets. It will have helpful tips and accurate sizing guides to determine the right size piece of jewelry you’re looking for. So many different guides are hard to understand and leave the reader more confused than when they started. The purpose of this guide is to help the reader with easy-to-follow sizing chart information. Read on to see all of our information on diamond jewelry sizing.

How to Guide on Diamond Jewelry Sizing

Ring Sizing Guide


  • Your ring should be loose enough to slide it over your knuckle without it falling off.
  • You’ll want to measure your ring a couple of times to get the best result. If your measurement is between two sizes, select the larger size.
  • Measuring your finger at the end of the day will produce the best results; fingers are at their largest size during this time.

Ring Band Width Measurement Chart:

2 mm = 1/16 inch
3 mm = 3/32 inch
4 mm = 1/8 inch
5 mm = 3/16 inch
6 mm = Slightly under 1/4 inch
7 mm = Slightly over 1/4 inch
8 mm = 5/16 inch
9 mm = Slightly under 3/8 inch

The formula most commonly used for getting ring sizes is outlined below. Reasonable consideration has been taken into effect to represent accurate and true ring size conversions; however, some countries use different interpretations for sizing rings.

Diameter = U.S. size x 0.4 + 11.50
Diameter = British size x 0.83 + 11.50
Diameter = Japanese size / 3 + 12.67

Diameter is stated in millimeters in all examples above.

Necklace Sizing Guide


  • Most traditional necklaces come in seven different lengths and the length will determine where the chain will hang on the body.
  • Women prefer to wear a necklace that hangs lower while men prefer to have necklaces that are closer to the neckline.

Standard Necklace Sizes for Children:

14’’ to 16’’ Standard Children’s Size

Standard Women’s Necklace Sizes:

16’’ = Choker length
17 to 18” = Reaches the collarbone
20” = Couple inches below the collarbone
22” = Above or at the neckline
24” = Slightly below the neckline
30” = Below the chest

Standard Men’s Necklace Sizes:

18” = For smaller necks
20” = Most common length for men
22” = Slightly below the collarbone
24” = Slightly above the sternum

Bracelet Sizing Guide


  • Use a cloth tape measure, piece of string or a piece of paper to wrap around your wrist.
  • Make a mark on the paper or cut the string and measure it on a ruler or tape measure.
  • Add 1/2 inch for toddlers, 1 inch for teens and adults.
  • Compare your measurement with the chart below.

Standard Bracelet Sizing Chart for Children:

Sizing: Inch: Millimeters:

Newborn 3 to 6 months 4” 102

12 to 18 months 5” 127

3 to 5 years 5” 127

Standard Bracelet Sizing Chart for Women:

Sizing: Inch: Millimeters:

Petite/Small 6” 165

Small/Medium 7” 178

Large/XL 8” 203

Women’s standard size ankle bracelets are 9 inches and 229 mm on average.

Standard Bracelet Sizing Chart for Men:

Sizing: Inch: Millimeters:

Small/Medium 8” 203

Medium/Large 9” 229

Large/XL 10” 254

Following the guide above will help you get an accurate size for all of your jewelry. We hope you found this diamond jewelry sizing guide to be useful, please share and comment!

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