The Definitive NZ/AU to US Ring Size & MM Converter
Finding your perfect fit shouldn't be a guessing game. Use our comprehensive conversion guide to transition between New Zealand's alphabetical sizing and international numerical standards for your next Miozuki fine jewellery piece.
Why Ring Sizing Matters for Fine Jewellery
In the world of fine jewellery, precision is everything. Whether you are eye-ing a Moissanite solitaire or a delicate set of pearl-adorned bands, the comfort and security of your ring depend on an accurate measurement. At Miozuki, we specialize in accessible luxury, bringing moissanite and pearl fine jewellery to the New Zealand and Australian markets. Because we often work with international standards, understanding how your NZ "Letter" size translates to US "Numbers" or Millimeters (MM) is essential.
New Zealand and Australia traditionally follow the British Alphabetical system (A-Z). However, many Moissanite stones and modern bridal settings are calibrated using the US Numerical system. This guide bridges that gap, ensuring your bespoke ring fits perfectly from the moment it arrives.
The Official Size Conversion Chart
Use the table below to find your equivalent size.
How to Measure Your Ring Size at Home
Method 1: The String/Paper Test
This method measures the circumference of your finger.
- Cut a thin strip of paper or a piece of non-stretchy string.
- Wrap it snugly around the base of your finger and the widest part of your knuckle.
- Mark the exact point where the ends meet.
- Lay the paper/string flat and measure the distance in millimeters with a ruler.
- Check the "Inner Circumference" column in our chart above.
Method 2: The Existing Ring Test
This method measures the inner diameter of a ring you already own.
- Select a ring that fits the specific finger you are shopping for.
- Place the ring on a ruler and measure the distance across the inside of the circle.
- Do not include the metal of the band in your measurement.
- Compare the millimeter reading to our "Inner Diameter" column.
Order Our $1 Ring Sizer
Each Miozuki ring is made just for you, so we recommend to order our ring sizer first to ensure the perfect fit. Please allow approximately 4 weeks lead time.
- Measure your ring size at home - easy and accurate.
- Complimentary engraving once your size is confirmed.
- Ring sizer + shipping cost is fully credited toward your ring purchase.
- Credit applies to rings only.
- All made-to-order rings are final sale (no returns or exchanges, engraved or not).
- We don’t offer resizing - each ring is crafted to your selected size.
Pro-Tips for an Accurate Fit
The "Evening Measure" Rule
Fingers tend to change size throughout the day. They are often smaller in the morning and swell during the evening or in warmer weather. For the most reliable fit, measure your finger at the end of the day when your hands are warm.
Consider the Band Width
The width of the ring band affects how it feels on your finger.
- Fine Bands (1.5mm - 2mm): Most Miozuki Moissanite rings feature delicate, elegant bands. These typically fit true to size.
- Wide Bands (5mm+): If you are choosing a wider "cigar" style band or a thick bridal stack, we recommend sizing up by half a size (one NZ letter) to ensure comfort.
Moissanite & Top-Heavy Designs
Because Moissanite is a high-refractive stone often featured in solitaire settings, these rings can sometimes be "top-heavy." A ring that is too loose will cause the stone to spin to the side of your finger. We recommend a "snug" fit—where the ring slides over the knuckle with a small amount of resistance but sits comfortably at the base.
Average Sizes in NZ & Australia
If you are purchasing a gift and cannot measure the person's finger, statistics for the NZ/AU market can help guide your choice:
- Average Woman: Most commonly sizes **N to P** (US 6.5 – 7.5).
- The "Safe" Bet: For a woman of average build, a **US size 6 or 7** (NZ M 1/2 or O 1/2) is the most statistically frequent size for engagement rings.
- Average Man: Most commonly sizes **T to W** (US 9.5 – 11).
Frequently Asked Questions
What if I am between sizes?
If you fall between two sizes on the chart, we generally recommend sizing down for thin, delicate bands (common in Moissanite jewellery) and sizing up for wider, thicker bands.
Does Miozuki offer a physical ring sizer?
Yes! We offer a $1 physical ring sizer that can be mailed to your NZ address. The best part? The $1 cost is credited toward your future custom or bespoke ring purchase with us.
How do I measure for a surprise proposal?
The best way is to "borrow" a ring your partner currently wears on their ring finger (left hand) and use the "Inner Diameter" method described above. Alternatively, ask a close friend or family member if they know the size.
Does warmer weathers affect ring size?
Absolutely. Heat causes fingers to swell. If you are measuring during a hot NZ summer, your fingers might be a half-size larger than they are in winter. Try to measure on a day with moderate temperature for the most "all-season" fit.
Ready to Find Your Dream Ring?
Now that you have your size, explore our collection of Japanese-inspired Moissanite and Pearl fine jewellery.
Still unsure? Order our $1 Ring Sizer today (credited toward your next order).
NZ Flat Shipping $8 | Japanese-Inspired Accessible Luxury