18ct london blue topaz & diamond montmartre ring
- The range was named after Montmartre, an area on the Right Bank in Paris was known for its many cafes and dance halls in the 1920s.
- The dimensions of the London blue topaz is 10mm x 8mm.
- Total diamond weight is 0.35ct.
- Our diamonds are premium cut, F/G colour and VS clarity.
- All precious gems are selected for their quality, colour and cut for Jan Logan designs.
- The metal used is 18ct white gold palladium, the highest quality white gold metal.
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All our metal merchants are certified with the Responsible Jewellery Council (RJC) as meeting ethical, human rights, social and environmental standards as established by the RJC's Certification System.
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All of our diamond suppliers adhere to the Kimberley process, a commitment to remove conflict diamonds from the global supply chain.
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Our coloured gemstones are natural so there can be a slight variance in colour.
- This piece was designed and produced by Jan Logan.
Most of our pieces are in stock and ready to dispatch with complimentary international express shipping on all orders. If an item is unavailable, our Customer Service Team will confirm production details upon purchase.
Please note, the made-to-order time frame is measured in business days and may vary by piece. Production time excludes processing and shipping.
- Gift wrapping is elegantly presented in Jan Logan’s signature brown box with a gift bag and personalised note.
- Six-month warranty on all purchases. Please see our Warranty & Repairs page for further information.
1. INTERNATIONAL RING SIZE CHART
| CIRCUM (MM) |
DIAM (MM) |
AUS, UK EUR |
USA | ASIA | SWISS |
|---|---|---|---|---|---|
| 44.2 | 14.1 | F | 3 | 4 | 4 |
| 44.8 | 14.3 | F½ | 5 | 5¼ | |
| 45.5 | 14.5 | G | 3½ | ||
| 46.1 | 14.7 | G½ | 6 | 6½ | |
| 46.8 | 14.9 | H | 4 | 7 | |
| 47.4 | 15.1 | H½ | ¾ | ||
| 48.0 | 15.3 | I | 4½ | 8 | |
| 48.7 | 15.5 | J | 9 | ||
| 49.3 | 15.7 | J½ | 5 | 9 | |
| 50.0 | 15.9 | K | 10 | ||
| 50.6 | 16.1 | K½ | 5½ | 10 | |
| 51.2 | 16.3 | L | 11¾ | ||
| 51.9 | 16.5 | L½ | 6 | 11 | 12¾ |
| 52.5 | 16.7 | M | 12 | ||
| 53.1 | 16.9 | M½ | 6½ | 13 | 14 |
| 53.8 | 17.1 | N | |||
| 54.4 | 17.3 | N½ | 7 | 14 | 15½ |
| 55.1 | 17.5 | O | |||
| 55.7 | 17.7 | O½ | 7½ | 15 | 16½ |
| 56.3 | 17.9 | P | |||
| 57.0 | 18.1 | P½ | 8 | 16 | 17¾ |
| 57.6 | 18.3 | Q | |||
| 58.3 | 18.5 | Q½ | 8½ | 17 | |
| 58.9 | 18.8 | R | 19 | ||
| 59.5 | 19.0 | R½ | 9 | 18 | |
| 60.2 | 19.2 | S | 20¼ | ||
| 60.8 | 19.4 | S½ | 9½ | 19 | |
| 61.4 | 19.6 | T | 21½ | ||
| 62.1 | 19.8 | T½ | 10 | 20 | |
| 62.7 | 20.0 | U | 21 | ||
| 63.4 | 20.2 | U½ | 10½ | 22 | 22¾ |
| 64.0 | 20.4 | V | |||
| 64.6 | 20.6 | V½ | 11 | 23 | |
| 65.3 | 20.8 | W | 25 | ||
| 65.9 | 21.0 | W½ | 11½ | 24 | |
| 66.6 | 21.2 | X | |||
| 67.2 | 21.4 | X½ | 12 | 25 | 27½ |
| 67.8 | 21.6 | Y | |||
| 68.5 | 21.8 | Z | 12½ | 26 | 28¾ |
| 69.1 | 22.0 | Z½ | |||
| 69.7 | 22.2 | Z+1 | 13 | 27 | |
| 70.4 | 22.4 | ||||
| 71.0 | 22.6 | 13 |