Ring Sizing Education

***Get your ring size accurate and correct the first time***

Determining your ring size is one of the most important parts of ordering a custom ring. Most custom rings cannot be resized, especially those with an inlay. So if you order the wrong size, this can cause headache and inconvenience for everyone involved, so let’s get this right the first time! Follow the steps below to ensure that you get the correct size, before you order your final ring.

Important Tip: Do not use an online ring sizer or paper strip, these are unreliable and will not help you determine an accurate ring size.


Step 1: Visit at least two reputable jewelers.

You may need to visit more than two, but the goal is to find two jewelers who both agree on your size. Ask them to use a “caliper” or “micrometer” to measure. Probably the most accurate measurement to provide to your custom jeweler is the inside diameter of the ring in milometers. If you have an existing ring in the same width and fit you are planning to buy, ask the jewelers to measure the inside diameter of this ring. That way you will know exactly what size to order your new ring in.

Keep in mind: All rings here at Jewelry by Johan have a Custom Comfort Fit. If you plan to order a ring from us, be sure to ask your local jewelers to measure your size in a Comfort Fit.

Ever wonder how your jeweler gets your ring sized just right? Scroll to the bottom of this page to see!


Step 2: Determine The Ring Width You Want.

Something to consider when getting your ring size taken is the width of the ring you want to order. Get sized in the particular width you are ordering because wider rings fit more snug than dainty rings. The wider the ring, the tighter you’ll feel it on your finger – so that’s why the size should go up alongside the width in some cases. Most plastic ring sizers have a total width of 3.5mm. If you purchase a ring with a total width of 8mm, your ring size will probably increase by a quarter size from the ring sizer that fit you best.


Step 3: Consider Comfort Fit vs. Standard Ring Sizes

All of our rings are made with a Comfort Fit unless you request otherwise. Comfort Fit rings are made with a slight curve on the interior sleeve of the ring, as opposed to a flat interior on the inside of a Standard Fit ring (illustrated in the picture below). Comfort Fit rings tend to go over the knuckle more easily and fit at the base of your finger better. Overall, they are simply more comfortable, especially for someone that is not used to wearing a ring every day. The interior curve of Comfort Fit rings is not noticeable to anyone looking at the ring on your hand, so if you’re worried that this type of fit will change the look of your ring, have no fear!  It’s only on the inside – and it’s very subtle.

Comfort Fit Jewelry by Johan Ring Sizing Education

Standard Fit Jewelry by Johan
Because of the slight rounded interior, a comfort fit band will fit slightly larger than the same size in a standard fit. This is because the size is taken from the peak of the rounded interior (the size read from the middle of the band on a mandrel) and not from one side to the other (read on the mandrel from the bottom of the ring). This is how confusion arises when getting your ring size measured at many jewelers. Ensure the jeweler knows that you want a ring with a comfort fit.

How should your ring fit?

The best fitting ring is the one you don’t know is there unless you see it. Here are some useful guidelines for determining a proper fitting ring.

When it comes to rings there’s no such thing as a perfect fit. For many, a good fit means comfortable most of the time. There are days when rings are too tight, and days when they’re a little loose. Your fingers fluctuate in size during the day due to temperature, diet, activities, etc. Please note that the time of year can also contribute to the ring not fitting comfortably. You may notice it feeling tighter in warmer months and looser in winter months. In the winter, try and keep your hands warm while sizing to ensure it will fit in the summer. If your hands stay cold while sizing, then your ring might be tighter in the summer. So how do you know when you have a good fit? A good rule of thumb is that when a ring fits easily over your knuckle, you should be able to get it on without struggle and then have a slight pull at the knuckle when removing it. You may need to twist the ring 1-2 times to get it off. Proper sizing is more of a personal preference than a perfect science.

Finger shape also plays a large role in determining the right fit of a ring. Some fingers are largest at the base and gradually taper without a prominent knuckle. On this type of finger, the ring should fit snugly at the base of the finger without causing bulges or a permanent indent. You should be able to push the ring up from the underside of your finger, and see a small space between the ring and the top of the finger, this gives your finger some breathing room.

Sizing fingers that are largest at the knuckle can be a bit trickier. The key here is to size the ring so it fits comfortably over the knuckle without being too large for the base of the finger. If there is a large size difference between the knuckle and base of the finger, the ring tends to spin and turn on the hand– especially in engagement rings which tend to be top heavy. A simple fix for this is to add sizing beads to the inside of the ring. They prevent some of the spinning while still maintaining a comfortable fit over the knuckle. See how much goes into making a ring fit and sit right? All this information may seem intimidating but what it comes down to is that comfort is key.

As stated before, rings with inlays cannot be resized. This is because the inlays go all around the ring with no joints. The inlays are handmade and cut out of solid pieces (Ex. Wood, Dinosaur Bone, Meteorite, Deer Antler) before they are inlaid on a metal (Ex. Titanium, Sterling Silver, Stainless Steel, Gold). All the more reason to make sure you get the correct ring size, the first time around.


Step 4: Order Our Free Custom Ring Sizers

 A few jewelers (like us!) offer the option to purchase custom ring sizers. These plastic sizers are fully refundable (or in another word, FREE) and are made in the exact width and fit of the ring that you’re ordering. Using this method allows you to actually feel and see how the ring looks on you before ordering the real thing.
(Note: Any ring sizers size 13 or above will have an additional fee of $15.00)


See below for our International Ring Sizing Chart. This will help you determine your size if ordering from another country.

INTERNATIONAL RING SIZING CHART

US SizeDia. (mm)Circ.(mm)BritishFrenchGermanJapaneseSwiss
0.50011.9437.52A
0.62512.0537.85
0.75012.1538.18A 1/2
0.87512.2638.50
1.00012.3638.83B1
1.12512.4639.15
1.25012.5739.48B 1/2
1.37512.6739.80
1.50012.7740.13C0.5
1.62512.8840.45
1.75012.9840.78C 1/21
1.87513.0841.10
2.00013.1941.43D41.5013.5021.75
2.12513.2941.76
2.25013.3942.08D 1/22.25
2.37513.5042.41
2.50013.6042.73E42.7513.7533.00
2.62513.7143.06
2.75013.8143.38E 1/23.5
2.87513.9143.71
3.00014.0244.03F441444.25
3.12514.1244.36
3.25014.2244.68F 1/254.75
3.37514.3345.0145.25
3.50014.4345.34G14.505.5
3.62514.5345.66
3.75014.6445.99G 1/246.5066.00
3.87514.7446.31
4.00014.8546.64H1576.75
4.12514.9546.96
4.25015.0547.29H 1/247.757.50
4.37515.1647.61
4.50015.2647.94I15.2588
4.62515.3648.264915.50
4.75015.4748.59J8.75
4.87515.5748.92
5.00015.6749.24J 1/215.7599.25
5.12515.7849.5750
5.25015.8849.89K10
5.37515.9850.22
5.50016.0950.54K 1/251.751610
5.62516.1950.87
5.75016.3051.19L11.25
5.87516.4051.52
6.00016.5051.85L 1/252.7516.501111.75
6.12516.6152.17
6.25016.7152.50M1212.5
6.37516.8152.82
6.50016.9253.15M 1/254171313.25
6.62517.0253.47
6.75017.1253.80N13.75
6.87517.2354.12
7.00017.3354.45N 1/255.2517.251414.50
7.12517.4454.77
7.25017.5455.10O15
7.37517.6455.43
7.50017.7555.75O 1/256.5017.751515.75
7.62517.8556.08
7.75017.9556.40P16.25
7.87518.0656.73
8.00018.1657.05P 1/257.75181617.00
8.12518.2657.38
8.25018.3757.70Q17.5
8.37518.4758.03
8.50018.5758.35Q 1/25818.501718.25
8.62518.6858.6859
8.75018.7859.01R19
8.87518.8959.33
9.00018.9959.66R 1/2191819.5
9.12519.0959.9860.25
9.25019.2060.31S20.25
9.37519.3060.63
9.50019.4060.96S 1/219.501920.75
9.62519.5161.2861.50
9.75019.6161.61T21.50
9.87519.7161.93
10.00019.8262.26T 1/2202022
10.12519.9262.59
10.25020.0362.91U62.752122.75
10.37520.1363.24
10.50020.2363.56U 1/220.252223.25
10.62520.3463.8963
10.75020.4464.21V24
10.87520.5464.54
11.00020.6564.86V 1/220.752324.75
11.12520.7565.1965
11.25020.8565.51W25.25
11.37520.9665.84
11.50021.0666.17W 1/2212426
11.62521.1666.4966.25
11.75021.2766.82X26.5
11.87521.3767.14
12.00021.4867.47X 1/267.5021.252527.25
12.12521.5867.79
12.25021.6868.12Y27.75
12.37521.7968.44
12.50021.8968.77Z68.7521.752628.50
12.62521.9969.09
12.75022.1069.42Z 1/229
12.87522.2069.75
13.00022.3070.07222729.75
13.12522.4170.40
13.25022.5170.72Z130.5
13.37522.6271.05
13.50022.7271.3731
13.62522.8271.70
13.75022.9372.02Z231.75
13.87523.0372.35
14.00023.1372.68Z332.25
14.12523.2473.00
14.25023.3473.3333
14.37523.4473.65
14.50023.5573.98Z433.5
14.62523.6574.30
14.75023.7574.6334.25
14.87523.8674.95
15.00023.9675.2834.75
15.12524.0775.60
15.25024.1775.9335.5
15.37524.2776.26
15.50024.3876.5836.25
15.62524.4876.91
15.75024.5877.2336.75
15.87524.6977.56
16.00024.7977.8837.5
16.12524.8978.21
16.25025.0078.53
16.37525.1078.86
16.50025.2179.18
16.62525.3179.51
16.75025.4179.84
16.87525.5280.16
17.00025.6280.49
17.12525.7280.81
17.25025.8381.14
17.37525.9381.46
17.50026.0381.79
17.62526.1482.11
17.75026.2482.44
17.87526.3482.76
18.00026.4583.09
18.12526.5583.42
18.25026.6683.74
18.37526.7684.07
18.50026.8684.39
18.62526.9784.72
18.75027.0785.04
18.87527.1785.37
19.00027.2885.69
19.12527.3886.02
19.25027.4886.34
19.37527.5986.67
19.50027.6987.00
19.62527.8087.32
19.75027.9087.65
19.87528.0087.97
20.00028.1188.30

 


How Does My Jeweler Determine My Ring Size?

How a ring fits on the finger can be very subjective, however how it is measured is not. Rings are typically measured on a graduated ring size mandrel but can be measured with a caliper if done properly. Here is a short explanation on how to measure a ring using either a graduated ring size mandrel and/or a caliper.

Mandrel – When measuring a ring, using a ring size mandrel, one must take note of the interior profile of the ring in order to ensure proper sizing. Image 1 shows the difference between a flat ring versus a comfort fit ring.

Though all ring sizes are read the same, where to read the interior profile of a ring can be confusing. When a ring size is taken, the measurement is read where the edge makes contact with the ring size mandrel, i.e its inside diameter. Image 2 shows two rings, both U.S. size 10.5, but one has a flat interior and the other has a comfort fit interior, being measured. They are both read where the ring makes contact with the sizing mandrel according to the rings inside profile. When looking at the two measurements, one would think that the ring on the left is smaller than the ring on the right. But because the ring on the right has a comfort fit, the size will be the same as the ring on the left.

ringsize2

Caliper – A ring’s size can be determined by using a caliper, but it will require some math and can be difficult for some ring profiles while proving to be easy on plain bands. We have used the same two rings from the ring size mandrel example in the following steps to show how each can be measured using a caliper.

1. Measure the outside diameter of the ring in three different spots and record.

ringsize3

2. Add all three measurements and divide by 3.

Flat: 24.33+24.32+24.33=72.98 / 3 = 24.33 mm average outside diameter

Comfort: 24.29+24.30+24.28= 72.91 / 3 = 24.29 mm average outside diameter

 3. Measure the ring’s thickness in three different spots and record.

ringsize4

4.  Add all three measurements and divide by 3

Flat: 2.05+2.05+2.05=6.15 / 3 = 2.05 mm average thickness

Comfort: 2.01+2.03+2.04= 6.08 / 3 = 2.03 mm average thickness

5.  Take the average outside diameter and subtract the average thickness twice. The result will be the inside diameter of the ring.

Flat: 24.33-2.05-2.05=20.23 mm inside diameter

Comfort: 24.29-2.03-2.03= 20.23 mm inside diameter

Both rings equal U.S. size 10.5

Either method for measuring rings can be used. It is important to verify that the ring size mandrel being used is accurate. There are a lot of different ring size mandrel manufacturing companies worldwide and their sizes vary depending on which one is used. Whenever we receive a new mandrel, we measure it as soon as we open it to verify if it is accurate or not. Approximately 50% of them will be off at least ⅛ size and up to ¾ of a size and must be returned. The same holds true for finger gauges.

 


 

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