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Outstanding Craftsmanship
Experienced Artisans -
Expert Gemmologist
Sourcing and Quality Control -
Lifetime Warranty
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Ethical Sourcing
Curated Partners
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- Regular price
- $3,850.00
Giro Diamond
- Regular price
- $3,850.00
Find Your Perfect Fit
A guide to accurate ring sizing and diamond proportions.
1. Ring Size Conversion Chart
We use the standard Australian/UK (Alphabetical) sizing system. Use the table below to find your match based on your diameter or circumference.
| Inside Diameter (mm) | Inside Circumference (mm) | AU / UK Size | US / Canada Size |
|---|---|---|---|
| 14.1 mm | 44.2 mm | F | 3 |
| 14.9 mm | 46.8 mm | H | 4 |
| 15.7 mm | 49.3 mm | J ½ | 5 |
| 16.5 mm | 51.9 mm | L ½ | 6 |
| 17.3 mm | 54.4 mm | N ½ | 7 |
| 18.1 mm | 57.0 mm | P ½ | 8 |
| 18.9 mm | 59.5 mm | R ½ | 9 |
Includes printable ruler and physical sizing circles.
2. Stone Size: mm vs. Carat Weight
Diamond carat weight measures mass, while millimeter (mm) measures physical dimensions. Use this as a visual reference for Round Brilliant cut stones.
| Carat Weight (ct) | Round Diameter (mm) | Style Guide |
|---|---|---|
| 0.25 ct | 4.1 mm | Subtle & Minimalist |
| 0.50 ct | 5.2 mm | The Classic Choice |
| 1.00 ct | 6.5 mm | Timeless Brilliance |
| 1.50 ct | 7.4 mm | Commanding Presence |
| 2.00 ct | 8.1 mm | Luxury Statement |
Professional Measurement Tips
Temperature: Fingers shrink in the cold and swell in the heat. Measure at the end of the day when your hands are warm.
Band Width: Wider bands feel tighter on the finger. If you are choosing a wide eternity band, we recommend ordering one half-size larger.
Between Sizes: If you fall between two sizes, always opt for the larger size to ensure a comfortable fit.
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Giro Diamond
- Regular price
- $3,850.00
The Giro Diamond is a full diamond eternity ring handcrafted in our Northern Rivers studio. A continuous band of diamonds set in ethical solid gold, totalling 0.93ct, in your choice of natural or lab-grown diamonds.
Made to order by Australian goldsmiths using gold sourced exclusively from ABC Refinery, Australia's only independent refiner with simultaneous LBMA, SGE, and CME COMEX accreditation. Looking at related substantial eternity bands? See the Veretta or the Tiara Ring.
Why the Giro Diamond
- Full diamond eternity: 0.93ct total diamond weight in F VS quality, set in a continuous line around the band.
- Substantial sparkle: nearly 1ct of diamonds reads as a major anniversary or statement piece while remaining wearable.
- Natural or lab-grown: available with either natural or lab-grown diamonds.
- Ethical gold sourcing: sourced from ABC Refinery, Australia's only independent refiner with LBMA, SGE, and CME COMEX accreditation.
- Italian goldsmith heritage: our founder is a member of the Università degli Orefici (est. 1508, Rome).
- Lifetime craftsmanship warranty: covers the workmanship of every Lucano ring for life. Free shipping Australia-wide.
Specs and details
- Total diamond weight: 0.93ct, F VS
- Setting: full eternity around band, in solid gold
- Metal: ethical solid gold
- Origin: Northern Rivers studio, Australia, hand-made to order
- Gold sourcing: ABC Refinery (LBMA, SGE, CME COMEX accredited)
- Lead time: 4 to 6 weeks
Frequently asked questions
What does Giro mean?
Giro is Italian for "turn" or "round." The Giro Diamond features a continuous turn of diamonds around the entire band, qualifying it as a full eternity ring.
Is the Giro a wedding band or anniversary ring?
At 0.93ct total diamond weight, the Giro reads as a substantial anniversary eternity ring or major wedding band. It pairs cleanly with Lucano engagement rings.
Natural or lab-grown?
Both options are offered. The price difference is meaningful at this carat weight: lab-grown delivers the same look at 50-70% of the natural price.
How long does it take to make?
Each Giro Diamond is hand-made to order in our Northern Rivers studio. Lead times typically run 4 to 6 weeks. Free shipping Australia-wide once dispatched, with Lucano's lifetime craftsmanship warranty.
Total Diamond Weight: 0.93 ct