Ring Size Chart

Last Updated: 2026-03-03 10:11:48 Category: Blog

Find Your Perfect Fit

CBT Diamonds | Connection · Beyond · Time

A ring is more than jewelry; it's a pledge of trust. To ensure your Bond is perfectly represented, we provide professional tools and a comprehensive guide to help you find your ideal size with absolute confidence (Trust).

I. Order a Professional Ring Sizer Kit

Experience salon-grade precision at home. We offer our Ring Sizer Kit through a "Deposit Now, Credit Later" program.

How it Works: Pay a small deposit to unlock your kit.
100% Credit: Receive an exclusive discount code via email to deduct the deposit from your final jewelry order.
Shipping: Dispatched within 7 business days.

Order Sizer Kit

II. How to Use the Sizer

1. Slide the sizer onto your finger just like a real ring.

2. Find the size that slides over your knuckle with slight resistance but fits snugly at the base.

3. The number indicated is your US Ring Size.

! Pro Tip:

Measure your finger at the end of the day when it's typically at its largest size for the most accurate fit.

III. At-Home Measurement (String Method)

If you need an immediate estimate, follow these steps:

1. Wrap a strip of paper or string firmly around the base of your finger.2. Mark the exact point where the ends meet.3. Measure the length in millimeters (mm) using a ruler.4. Refer to our Size Conversion Chart below to find your match.

Note: The string method provides an estimate. For the most accurate size, we recommend using our professional Ring Sizer Kit.

IV. Measurement Tips

Timing: Measure your finger at the end of the day when it is at its largest. Finger size can fluctuate throughout the day due to temperature and activity.
The Knuckle Factor: If you have larger knuckles, ensure the size you choose can slide over the knuckle comfortably. The ring should fit snugly at the base but pass over the knuckle without excessive force.
Wide Bands: For rings with a wider band (>4mm), we recommend going up by half a size. Wider bands feel tighter than narrow bands of the same size.

? Still Unsure?

Contact our jewelry experts for personalized sizing advice. We're here to help you find the perfect fit.

Ring Size Conversion Chart

International Ring Size Comparison Table

US Size	Hong Kong Size	Japan Size	UK Size	Finger Circumference(mm)	Ring Diameter(mm)
2.5	5	4	E	42.73	13.6
3	6	5	F	44.45	14.15
3.5	7	6	G	45.87	14.6
4	8	7	H	46.97	14.95
4.5	9	8	I	47.91	15.25
5	10	9	J	49.01	15.6
5.5	11	10	K	50.11	15.95
5.5	12	11	L	51.37	16.36
6	13	12	M	52.15	16.6
6.5	14	13	M	53.25	16.95
7	15	14	N	54.35	17.3
7.5	16	15	O	55.45	17.65
8	17	16	P	56.55	18
8.5	18	18	Q	57.65	18.35
8.5	19	19	R	58.75	18.7
9	20	19	S	59.85	19.05
9.5	21	20	T	60.95	19.4
10	22	21	U	62.05	19.75
10.5	23	23	V	63.15	20.1
11	24	24	V	64.4	20.5
11.5	25	25	W	65.66	20.9
11.5	26	26	X	66.44	21.15
12	27	27	Y	67.86	21.6
12.5	28	28	Z	68.96	21.95

Ready to Find Your Perfect Ring?

Now that you know your perfect size, explore our exquisite collection of rings crafted with precision and passion. Each piece is a testament to our commitment to quality and timeless beauty.

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