Engagement Ring Education

Q: Who do I contact for sizing help?

Email : support@omgemsus.com - include your question, or a photo of an existing ring with a ruler if you're stuck, and our team will help you figure out the right size.

Option 1 Option 2

Measure Your Ring Size Without a Ring

Step 1 - Prepare the Paper
Cut a narrow paper strip that is long enough to wrap easily and comfortably around your finger.

Step 2 - Wrap and Mark
Wrap the paper snugly around your finger and clearly mark the exact point where both ends meet.

Step 3 - Measure the Length
Place the strip flat on a millimetre ruler and carefully measure from the edge to the marked point.

Step 4 - Check Your Size
Match your measurement with the closest value on our ring size chart to find your correct size.

Measure Your Ring Size Without a Ring.

Step 1 - Prepare the Ruler
Place a millimetre ruler on a flat, stable surface. Make sure the measurement marks are clear and easy to read.

Step 2 - Position the Ring
Lay your ring flat on the ruler. Carefully align one inner edge of the ring with the starting measurement mark.

Step 3 - Measure the Diameter
Measure straight across the widest inside part of the ring. Record the diameter from one inner edge to the other in millimetres.

Step 4 - Find Your Ring Size
Locate your measured inside diameter on our ring size chart. Follow the same row to find your correct ring size.

Find Your Perfect Ring Size

I Know My Size In

Select Size

Show My Size In

Your Size In UK/AU/India Size

E

Conversions are a guide. For the most accurate fit, we recommend getting professionally sized.

International Ring Size Chart

USA, Canada	Europe	UK, Australia, NZ, Ireland	Inside Diameter (mm)	Circumference (mm)
2.25	42.50	E	13.50	42.4
2.50	43	E 1/2	13.70	43.0
2.75	43.50	F	14.0	43.6
3	44	F 1/2	14.1	44.2
3.25	45	G	14.3	44.8
3.50	45.5	G 1/2	14.5	45.5
3.75	46	H	14.7	46.1
4	47	H 1/2	14.9	46.8
4.25	47.5	I	15.1	47.4
4.50	48	I 1/2	15.3	48.0
4.75	48.5	J	15.5	48.7
5	49	J 1/2	15.7	49.3
5.25	50	K	15.9	50.0
5.50	50.5	K 1/2	16.1	50.6
5.75	51	L	16.3	51.2
6	52	L 1/2	16.5	51.9
6.25	52.5	M	16.7	52.5
6.50	53	M 1/2	16.9	53.1
6.75	53.5	N	17.1	53.8
7	54	N 1/2	17.3	54.4
7.25	55	O	17.5	55.1
7.50	55.5	O 1/2	17.7	55.7
7.75	56	P	17.9	56.3
8	57	P 1/2	18.1	57.0
8.25	57.5	Q	18.3	57.6
8.50	58	Q 1/2	18.5	58.3
8.75	59	R	18.8	58.9
9	59.5	R 1/2	19.0	59.5
9.25	60	S	19.2	60.2
9.50	61	S 1/2	19.4	60.8
9.75	61.5	T	19.6	61.4
10	62	T 1/2	19.8	62.1
10.25	62.5	U	20.0	62.7
10.50	63	U 1/2	20.2	63.4
10.75	64	V	20.4	64.0
11	64.5	V 1/2	20.6	64.6
11.25	65	W	20.8	65.3
11.50	66	W 1/2	21.0	65.9
11.75	66.5	X	21.2	66.6
12	67	X 1/2	21.4	67.2
12.25	67.5	Y	21.6	67.8
12.50	68	Z	21.8	68.5
12.75	69	Z 1/2	22.0	69.1
13	70	Z + 1	22.2	69.7
13.25	70.5	Z + 1 1/2	22.4	70.4
13.50	71	Z + 2	22.6	71.0

Download Chart

How do I measure my ring size at home?

Take a strip of paper or thread, wrap it around your finger, and mark where the ends meet. Measure that length against a ruler, then check our size chart to find your match. Try measuring in the evening - fingers are usually a touch bigger by then.

Can I use my own country's ring size when ordering?

Yes, that's fine. Just run it through our size converter first to match it to our system. Not sure the numbers are right? Email us and we'll double-check before your order goes out.

What happens if the ring doesn't fit when it arrives?

Resizing is available as a paid service, and you have 30 days from delivery to request it. Most rings can go up or down by a full size. A few detailed designs can't be resized without changing how they look - we'll tell you upfront if that's the case for your piece.

How many times can a ring be resized?

We recommend treating resizing as a one-time adjustment per ring. Multiple resizes can weaken the metal over time, especially around thinner bands or pavé settings, so it's worth taking a little extra care measuring correctly the first time.

Still unsure of your size?

No problem - measure at home with our guide, get checked at a local jeweler, or just message us. Send a photo of a ring you already own next to a ruler, and we can usually help estimate your size from there.

Who do I contact for sizing help?

Email : support@omgemsus.com - include your question, or a photo of an existing ring with a ruler if you're stuck, and our team will help you figure out the right size.