Jewellery and Watch Size Guide
OD's Jewellers Master Jewellery Size Guide
Complete Sizing Reference for Rings, Bracelets, Necklaces & Watches
Why This Hub Exists
At OD's Jewellers, perfect fit matters. Whether you're buying for yourself or gifting to someone special, understanding jewellery sizing removes guesswork and ensures confident purchases.
This hub compiles universal sizing principles that apply across all our brands—from engagement rings to charm bracelets, from necklace lengths to watch case diameters. While each brand has specific recommendations (linked throughout), the principles here form the foundation of proper jewellery sizing.
Visit us at 41 Barrow Street, St Helens for complimentary professional sizing—we'll measure accurately and explain how different brands fit differently.
Ring Sizing
Understanding Ring Sizes
Ring sizes measure the internal circumference or diameter of a ring. The UK uses alphabetical sizing (A–Z), while other regions use numerical systems.
All sizing information is provided as a retail reference. Only an Assay Office can legally confirm metal purity or hallmark compliance.
Key principle: Ring size varies by:
- Finger width and knuckle size
- Time of day (fingers swell in heat, shrink in cold)
- Dominant vs. non-dominant hand (dominant hand fingers are typically ½ size larger)
- Pregnancy, weight changes, or medical conditions
UK Ring Size Chart (Complete)
| UK | Diameter (mm) | Circumference (mm) | US | EU |
|---|---|---|---|---|
| A | 12.0 | 37.8 | – | 37 |
| B | 12.4 | 39.1 | – | 39 |
| C | 12.8 | 40.3 | – | 40 |
| D | 13.2 | 41.6 | 1.5 | 41 |
| E | 13.6 | 42.9 | 2.5 | 43 |
| F | 14.0 | 44.2 | 3 | 44 |
| G | 14.4 | 45.5 | 3.5 | 45 |
| H | 14.8 | 46.8 | 4 | 47 |
| I | 15.3 | 48.0 | 4.5 | 48 |
| J | 15.7 | 49.3 | 5 | 49 |
| K | 16.1 | 50.6 | 5.5 | 51 |
| L | 16.5 | 51.9 | 6 | 52 |
| M | 16.9 | 53.1 | 6.5 | 53 |
| N | 17.3 | 54.4 | 7 | 54 |
| O | 17.7 | 55.7 | 7.5 | 56 |
| P | 18.1 | 57.0 | 8 | 57 |
| Q | 18.5 | 58.3 | 8.5 | 58 |
| R | 18.9 | 59.5 | 9 | 60 |
| S | 19.3 | 60.8 | 9.5 | 61 |
| T | 19.7 | 62.1 | 10 | 62 |
| U | 20.2 | 63.4 | 10.5 | 63 |
| V | 20.6 | 64.6 | 11 | 65 |
| W | 21.0 | 65.9 | 11.5 | 66 |
| X | 21.4 | 67.2 | 12 | 67 |
| Y | 21.8 | 68.5 | 12.5 | 69 |
| Z | 22.2 | 69.7 | 13 | 70 |
How to Measure Ring Size at Home
Method 1: String or Paper Method
- Cut a thin strip of paper or string (approximately 10cm long).
- Wrap it snugly around the base of your finger (where the ring will sit).
- Mark where the paper/string overlaps with a pen.
- Measure the marked length in millimetres with a ruler.
- Compare this measurement to the Circumference (mm) column in the chart above.
- If between sizes, always round UP for comfort.
- Measure at the end of the day when fingers are warmest
- Measure 3–4 times to ensure accuracy
- Account for knuckle size—ring must slide over knuckle comfortably
Method 2: Existing Ring Method
- Find a ring that fits the intended finger perfectly.
- Place it on a flat surface.
- Measure the internal diameter (inside edge to inside edge) in millimetres.
- Compare to the Diameter (mm) column in the chart above.
- The existing ring fits properly (not too tight or loose)
- You measure the internal diameter accurately
- The ring band is standard width (wide bands require larger sizes)
Method 3: Professional Sizing (Most Accurate)
Visit OD's Jewellers for complimentary professional sizing:
- We use professional ring sizers (precise metal gauges)
- We measure multiple times to ensure accuracy
- We account for knuckle size and finger shape
- We explain how different ring widths affect sizing
- We record your measurements for future purchases
Why professional sizing matters:
- Home measurements can be inaccurate by 1–2 sizes
- Prevents costly returns or resizing fees
- Ensures gift purchases fit perfectly first time
Book your complimentary sizing appointment at OD's—call 01744 730985 or visit in-store.
Ring Sizing Guidelines
Average Women's Sizes
Most common: UK L–N (US 6–7)
Range: UK J–Q (US 5–8.5)
Average Men's Sizes
Most common: UK T–V (US 10–11)
Range: UK R–Z (US 9–13)
Children's Sizes
Typical: UK F–J (US 3–5)
Note: Measure professionally—children's fingers grow quickly
Wide vs. Narrow Bands
- Narrow bands (2–4mm): Order your true size
- Medium bands (5–7mm): Consider going up ½ size for comfort
- Wide bands (8mm+): Consider going up ½–1 full size
Why? Wide bands have more contact with your finger, requiring more space to slide over knuckles comfortably.
Ring Resizing Considerations
✅ Can be resized:
- Plain metal bands (gold, silver, platinum)
- Rings with stones on top half only
- Rings without intricate detailing around entire band
❌ Cannot be resized:
- Eternity rings (stones encircle entire band)
- Multi-layer plated rings (damages plating)
- Rings with enamel or decorative work around entire band
- Titanium, tungsten, or other non-traditional metals
For plated or stretch-style designs, professional resizing is not recommended as it compromises finish integrity.
- UNOde50: Cannot resize due to 15–20 micron multi-layer plating
- Diamonfire: Cannot resize due to triple precious metal plating
- Nomination: Adjustable open-style rings available
- Kit Heath: Standard UK sizes, professional resizing available at OD's
Bracelet Sizing
Understanding Bracelet Fit
Bracelet sizing depends on:
- Wrist circumference
- Desired fit (snug, comfortable, or loose)
- Bracelet style (bangle, chain, cuff)
- Clasp type and adjustability
How to Measure Wrist Circumference
- Use a flexible measuring tape or string.
- Wrap around your wrist at the widest point (just below the wrist bone).
- Mark where it meets or note the measurement.
- If using string, measure against a ruler in centimetres.
- Do not pull tight—measure comfortably, as you'd wear a bracelet.
Bracelet Size Chart (Universal)
| Wrist Circumference (cm) | Wrist Circumference (inches) | Bracelet Length Needed |
|---|---|---|
| 14–15 cm | 5.5–6" | Extra Small: 16–17 cm (6.5") |
| 15–16 cm | 6–6.5" | Small: 17–18 cm (7") |
| 16–17 cm | 6.5–7" | Medium: 18–19 cm (7.5") |
| 17–18 cm | 7–7.5" | Large: 19–20 cm (8") |
| 18–19 cm | 7.5–8" | Extra Large: 20–21 cm (8.5") |
Formula: Wrist measurement + 1.5–2.5 cm for comfortable fit
Fit Preferences
Snug Fit (Wrist + 1.5 cm)
- Bracelet sits close to wrist
- Minimal movement
Best for: delicate chains, tennis bracelets, fitness trackers
Comfortable Fit (Wrist + 2 cm)
- Standard fit for most bracelets
- Slight movement, comfortable all day
Best for: everyday wear, charm bracelets, link bracelets
Loose Fit (Wrist + 2.5–3 cm)
- Drapes freely, slides up/down arm
- Fashion-forward, statement look
Best for: bangles, cuffs, stacked bracelets
Bangle Sizing (Rigid Bracelets)
Bangles slip over the hand, so sizing differs from chain bracelets:
- Bring thumb and pinky finger together (as if making a "duck mouth").
- Measure the widest point across your hand (knuckles).
- Choose bangle with internal diameter slightly larger than this measurement.
Tip: If your knuckles are notably wider than your wrist, size up one step to pass over the hand comfortably.
Bangle Size Chart:
| Hand Width (cm) | Bangle Size | Fit |
|---|---|---|
| 6.5–7 cm | Small | Snug |
| 7–7.5 cm | Medium | Standard |
| 7.5–8 cm | Large | Comfortable |
| 8+ cm | Extra Large | Loose |
Stainless steel, silver, and plating alloys are generally skin-safe, but individual sensitivities can occur.
Brand-Specific Bracelet Sizing
Nomination Composable®:
- Fully adjustable—add or remove links
- Formula: Wrist (cm) + 2 links (snug) or + 3 links (comfortable)
- Average women's: 18 links
- Children: 13–15 links
- Men: 20–22 links
ChloBo:
- Standard: 18 cm (women), 20 cm (men), 15 cm (children)
- Made-to-measure alterations available (adult only)
Thomas Sabo Charm Club:
- Adjustable lengths typically 16–21 cm
- Extension chains available
Coeur de Lion:
- Standard sizing: Small (15–17 cm), Medium (17–19 cm), Large (19–21 cm)
- Most designs include 3cm extension chain
Necklace Sizing
Understanding Necklace Lengths
Necklace length dramatically affects style and wearability. The same pendant looks completely different at 16" vs. 24".
Key factors:
- Neck circumference
- Body proportions
- Neckline of clothing
- Pendant size and weight
- Personal style preference
Standard Necklace Length Guide (Women)
| Length | Name | Placement | Best For |
|---|---|---|---|
| 14–16" (35–40cm) | Choker | Sits at base of neck | High necklines, petite frames, delicate pendants |
| 18" (45cm) | Princess | Falls at collarbone | Most versatile length, suits most necklines and body types |
| 20–22" (50–55cm) | Matinee | Falls below collarbone to bust | Low necklines, business wear, layering |
| 24–30" (60–75cm) | Opera | Falls to bust or below | Evening wear, dramatic statements, layering |
| 30–36" (75–90cm) | Rope | Falls to waist | Can be doubled, knotted, or worn long for dramatic effect |
Most popular: 18" (45cm) Princess length—flatters most body types and works with most necklines.
Standard Necklace Length Guide (Men)
| Length | Placement | Best For |
|---|---|---|
| 18" (45cm) | Base of neck | Slim builds, fitted clothing |
| 20" (50cm) | At collarbone | Most common, average builds |
| 22" (55cm) | Below collarbone | Larger builds, casual wear |
| 24" (60cm) | Mid-chest | Relaxed fit, layering |
How to Choose Necklace Length
Consider your height:
- Petite (under 5'4"): 14–18" looks proportional
- Average (5'4"–5'7"): 18–22" most flattering
- Tall (over 5'7"): 20–24"+ creates balance
Consider neckline:
- Crew/high neck: 18–20" sits outside neckline
- V-neck: 18–22" follows V-shape
- Scoop neck: 16–20" complements curve
- Strapless/off-shoulder: 14–16" choker or 20"+ statement
Consider pendant size:
- Small/delicate: 16–18" shorter lengths
- Medium: 18–20" standard
- Large/statement: 20–24"+ longer lengths prevent overwhelming
Layering Necklaces
The Rule of Three: Layer necklaces in increments of 2–4 inches for distinct, visible separation.
Classic combinations:
- 16" + 18" + 20"
- 16" + 20" + 24"
- 18" + 22" + 26"
Layering tips:
- Mix textures (fine chain + chunky chain + pendant)
- Vary pendant sizes
- Keep to 2–3 necklaces max (more looks cluttered)
- Consider dedicated layering necklaces with built-in spacers
Brand-Specific Necklace Sizing
Kit Heath:
- Standard: 18" (45cm) with 2" extender
- Adjustable slider chains available
Coeur de Lion:
- Choker: 40cm | Princess: 43–45cm | Long: 60–100cm
- Most include extension chains
Laura Ashley:
- Choker: 35–40cm | Mid: 40–45cm | Pendant: 45–50cm | Long: 60cm+
Nomination:
- Women's versatile: 45–54cm
- Long layering: 60–84cm
- Men's standard: 48–52cm
Watch Sizing
Understanding Watch Case Size
Watch sizing involves two measurements:
- Case diameter (mm)—how wide the watch face is
- Wrist circumference (cm/inches)—your wrist size
Key principle:
The right case size depends on wrist size, personal style, and watch purpose (dress vs. sport).
Watch Case Size Guidelines
Men's Watches
| Wrist Circumference | Small Case (36–40mm) | Medium Case (40–44mm) | Large Case (44–48mm) |
|---|---|---|---|
| 14–16 cm (5.5–6.5") | ✅ Perfect | ⚠️ Large | ❌ Too large |
| 16–18 cm (6.5–7") | ✅ Elegant | ✅ Perfect | ⚠️ Large |
| 18–20 cm (7–8") | ⚠️ Small | ✅ Perfect | ✅ Statement |
| 20+ cm (8"+) | ❌ Too small | ✅ Versatile | ✅ Perfect |
Most popular: 40–42mm (versatile, suits most wrist sizes)
Women's Watches
| Wrist Circumference | Small Case (26–32mm) | Medium Case (32–36mm) | Large Case (36–40mm) |
|---|---|---|---|
| 13–15 cm (5–6") | ✅ Perfect | ⚠️ Large | ❌ Too large |
| 15–17 cm (6–6.5") | ✅ Delicate | ✅ Perfect | ⚠️ Large |
| 17–19 cm (6.5–7.5") | ⚠️ Small | ✅ Perfect | ✅ Statement |
| 19+ cm (7.5"+) | ❌ Too small | ✅ Versatile | ✅ Perfect |
Most popular: 32–36mm (elegant proportions, classic sizing)
The Lug-to-Lug Test
Beyond case diameter, consider lug-to-lug distance (length of watch from top to bottom):
Rule: Lugs should not extend beyond your wrist width.
- Measure wrist width (not circumference)—side to side across top of wrist
- Compare to watch's lug-to-lug measurement
- If lugs overhang, watch will look too large and feel uncomfortable
For small wrists (<16cm), aim for lug-to-lug ≤ 47mm for comfort.
Watch Strap/Bracelet Sizing
Typical lug widths:
- Women: 12–18mm
- Men: 18–24mm
Typical strap lengths (two-piece, excluding buckle):
- Women: ~105/65mm
- Men: ~120/75mm (varies by brand and wrist)
Note: OEM and integrated bracelets vary significantly; always verify lug width, strap length, and hole spacing against the specific model.
Bracelet adjustments:
- Link removal/addition for perfect fit
- Micro-adjustments on clasps (fine-tuning)
- Extension clasps for wrist swelling (hot weather, flights)
At OD's: Complimentary bracelet sizing with every watch purchase—we measure, adjust, and record your link count for future purchases.
We'll size your new watch while you wait—included with every purchase.
Brand-Specific Watch Sizing
Citizen:
- Women: 26–36mm | Unisex: 36–38mm | Men: 38–46mm
- Eco-Drive ranges (solar): 36–46mm typical depending on line
Tissot:
- Women: 28–36mm | Men: 40–44mm
- Powermatic 80 models: 40–44mm typical
- PRX: 35mm (unisex), 40mm (traditional men's)
Olivia Burton:
- Midi Dial: 30mm (most popular) | Big Dial: 38mm
Tommy Hilfiger:
- Women: 28–36mm | Unisex: 36–40mm | Men: 40–44mm
BOSS:
- Women: 32–38mm | Men: 40–46mm
- Bold chronographs: 44mm+
Children's Jewellery Sizing
Safety Notice: Jewellery for children under 36 months should only be worn under adult supervision and never left on overnight.
Children's Ring Sizes
| Age Range | Typical UK Size | Diameter (mm) |
|---|---|---|
| 3–5 years | D–F | 13.2–14.0 |
| 6–8 years | F–H | 14.0–14.8 |
| 9–11 years | H–J | 14.8–15.7 |
| 12–14 years | J–L | 15.7–16.5 |
Important: Children's fingers grow quickly—measure professionally and consider adjustable designs.
Children's Bracelet Sizes
| Age Range | Wrist Circumference | Bracelet Length |
|---|---|---|
| 3–5 years | 11–13 cm | 13–15 cm |
| 6–8 years | 13–14 cm | 15–16 cm |
| 9–11 years | 14–15 cm | 16–17 cm |
| 12–14 years | 15–16 cm | 17–18 cm |
- Nomination: 13–15 links (children's sizing)
- ChloBo: 15 cm standard (ages 3+, no alterations available)
Children's Necklace Lengths
| Age Range | Recommended Length |
|---|---|
| 3–5 years | 12–14" (30–35cm) |
| 6–8 years | 14–16" (35–40cm) |
| 9–11 years | 16" (40cm) |
| 12–14 years | 16–18" (40–45cm) |
Safety: Avoid long chains on active children and remove jewellery for sleep and sports.
Gifting Without Knowing Size
Strategies for Secret Sizing
For rings:
- Borrow an existing ring they wear on the intended finger
- Trace the inside on paper or press into soap
- Ask a close friend/family member who knows their size
- Choose adjustable open-style rings
- Purchase a gift voucher for in-store sizing at OD's
For bracelets:
- Choose designs with adjustable clasps or extension chains
- Estimate based on their build (petite/average/larger frame)
- Opt for brands with easy link adjustment (Nomination, Thomas Sabo)
For necklaces:
- Choose 18" Princess length (most versatile)
- Ensure necklace includes extender chain
- Consider adjustable slider chains
For watches:
- Check existing watches they wear for case size
- Choose mid-range sizes (women 32–34mm, men 40–42mm)
- Remember: OD's offers complimentary bracelet sizing with gift receipt
OD's Gift Sizing Service
We make gifting stress-free:
✅ Gift receipts with full exchange policy
- No awkward price reveals
- Hassle-free size exchanges
- Valid for 30 days
✅ Gift vouchers with personal consultation
- Recipient books sizing appointment
- Expert guidance on choosing perfect piece
- Memorable in-store experience
✅ Secret sizing appointments
- Discreet measurements without spoiling surprise
- We coordinate with gift-giver
- Perfect fit guaranteed
Prefer to let them choose? OD's Gift Vouchers include a free sizing consultation.
OD's Professional Sizing Services
Complimentary Services
✅ Professional ring sizing
- Precision measuring with professional gauges
- Knuckle size assessment
- Size recording for future purchases
✅ Watch bracelet sizing
- Link removal/addition
- Micro-adjustment optimization
- Link count recorded for future reference
✅ Bracelet length consultation
- Wrist measurement
- Fit preference guidance
- Adjustment recommendations
✅ Necklace length try-on
- See how different lengths look on you
- Layering advice
- Neckline compatibility guidance
Expert Advice (Always Free)
- 🎯 Style guidance: Which sizes suit your proportions and style
- 🎯 Brand comparisons: How different brands fit differently
- 🎯 Gift planning: Strategies for surprise sizing
- 🎯 Resizing feasibility: Can your piece be resized, and should it be?
FAQs
What if I'm between sizes?
Rings: Always size up—easier to add sizing beads than resize down.
Bracelets: Choose comfortable fit (not too snug).
Watches: Consider proportions—slightly smaller often looks more elegant.
Do fingers swell in hot weather?
Yes—fingers can swell up to ½ size in heat, humidity, or after exercise. They also swell during pregnancy, with certain medications, or after salty meals.
Best practice: Measure at room temperature at end of day.
Can I resize any ring?
Not all rings can be resized—see Ring Resizing Considerations above.
Cannot resize: Eternity rings, multi-plated rings, titanium/tungsten, rings with enamel/stones around entire band.
Visit OD's for professional assessment.
Should I buy a bracelet that fits over my hand or uses a clasp?
Bangles (slip-over): Must fit over widest part of hand—measure hand width, not wrist.
Clasp bracelets: Measure wrist circumference + add for desired fit.
Both styles available at OD's—we'll help you choose.
How do I measure for a watch if I've never worn one?
Visit OD's to try on different case sizes. See how they look on your wrist in person. We'll guide you to proportional sizing for your build.
What's the best necklace length for layering?
Start with 18" as your base. Add 20" and/or 22" for 2–3 layer effect. Keep 2–4" spacing between lengths for distinct visibility.
How tight should a ring be?
- Should slide over knuckle with slight resistance
- Should feel secure on finger base (not spinning freely)
- Should come off with gentle twisting/pulling (not require soap/force)
- If you need soap to remove it, it's too small.
Can children's jewellery grow with them?
Choose adjustable designs where possible:
- Nomination charm bracelets: Add links as they grow
- ChloBo: 15cm fits ages 3+ (no adjustments available)
- Expect to replace children's jewellery every 1–3 years as they grow
Brand-Specific Size Guides
For detailed sizing specific to your brand, see: