Ring Size and Stone Size: Find Your Fit and Look
Ring size tells you how a ring fits your finger. Stone size tells you how much space the gemstone occupies. Choosing the two separately makes it easier to find the fit and appearance you want.
Start with the intended finger, use the ring-size reference below, then compare the main stone dimensions and the on-hand photograph.
Find a comfortable ring size
The size chart is a general, approximate reference. If measurements differ, the finger circumference listed in the product’s options takes priority.
For the most reliable measurement, use a physical ring sizer or ask a jeweler to measure the finger and hand on which you will wear the ring. A ring should pass over the knuckle without painful pressure and sit comfortably at the base of the finger.
Check your size when your hands are at a normal temperature, and repeat the check at another time. Fingers can change size with temperature and time of day. A wide band may feel tighter than a narrow band, even when both have the same size label.
A paper strip or string can stretch, twist or sit unevenly. Treat that method as an estimate rather than the final fit check.
Ring-size reference
Inside diameter is the distance straight across the ring's inner opening. Finger circumference is the distance around the finger. Use the column that matches the measurement you have taken.
| US size | HK label in this guide | Inside diameter (mm) | Finger circumference reference (mm) |
|---|---|---|---|
| 5 | 11 | 15.9 | 49.9 |
| 6 | 13 | 16.6 | 52.1 |
| 7 | 15 | 17.3 | 54.3 |
| 8 | 17 | 18 | 56.3 |
| 9 | 19 | 18.7 | 58.7 |
The HK labels above belong to this reference chart. When ordering, follow the size system and available options on the product page. A regional conversion from another chart may use different rounding.
Compare round stones on a hand
Fugui JewelryRound stone size on a hand
The photograph includes these 16 labels: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0 and 5.0 ct. It helps show how the visual presence changes across the range.
Use this as a round-stone comparison. An oval, pear or emerald-shaped stone has a different outline, and a halo or surrounding accents can increase the setting's overall coverage. A photograph also changes displayed size with your screen and zoom level.
Read millimeters, carats and DEW separately
- Millimeters (mm) describe physical dimensions. For a round stone, compare diameter. For an elongated stone, compare length and width together.
- Carat (ct) is a unit of weight. Weight alone does not fix a stone's face-up dimensions: shape and cutting proportions also matter.
- Diamond equivalent weight (DEW) describes a size comparison with diamond. It is not the moissanite's actual carat weight.
For a precise size comparison, pair the photograph with the stone dimensions given for the piece you are considering. A ct label alone does not give the stone's diameter. Read the stated measurements alongside the carat description.
Style ideas for different hands
Use these starting points to compare the look you like; every ring style can be worn on different hands. Comfort, a measured ring size and room to pass the knuckle come first.
Explore: Balanced proportions · Tapered fingers · Long fingers · Fuller fingers · Prominent knuckles · Shorter fingers
Balanced proportions
Try a simple solitaire if you like a clear focal point, or compare four-prong and six-prong settings. Choose the profile and band width you enjoy looking at on your own hand.
Tapered fingers
A halo or cluster can give a broader outline if that is the look you prefer. Compare it with a solitaire in the same ring size and decide how much coverage feels right.
Long fingers
Try a sculptural setting or a small stack if you enjoy more detail. A single simple band is an equally valid choice; check how neighboring rings sit together.
Fuller fingers
A V-shaped or curved design can create an angled line if that appeals to you. Compare several band widths in the correct size and choose the fit that stays comfortable.
Prominent knuckles
Curved or twisted bands offer another line to compare with a plain band. Have the ring sized to pass the knuckle without painful pressure and sit comfortably at the base.
Shorter fingers
An oval, pear or marquise shape set along the finger can create a longer vertical outline. Choose the stone size and setting height you like, then check clearance when you bend your hand.
The hand photographs illustrate proportions only. Check the fit and measurements of the ring you choose, and use the ring-size guidance before ordering.
Before you choose
- Choose the ring size that fits the intended finger and the band's width.
- Compare the main stone's millimeter dimensions and shape.
- Check the whole setting's dimensions, including any halo or surrounding stones.
- Use the on-hand view to judge the appearance you prefer.
To understand the material itself, read What is moissanite? For the metal base and surface finish, see S925 silver, plated finishes and care.