Complimentary Delivery
All taxes and customs duties included
Lifetime Maintenance
Complimentary cleaning and polishing for life
Free Returns
Returns within 14 days. T's & C's apply
Hallmarked
Independently hallmarked to verify authenticity and value
€0,00 EUR
COMPLIMENTARY SHIPPING & RETURNS
LIFETIME MAINTENANCE PLAN
Clearpay 0% Credit
925 Sterling Silver and 18k Yellow Gold Plated
Handcrafted in gold-plated sterling silver, this weighty signet ring is set with a polished cushion-shaped onyx, hand-selected for its depth of colour and quality. The stone’s rich black tone is framed by clean, sculpted lines, giving the piece a bold yet refined presence. Made with substance and finished by hand, it’s a modern take on a timeless signet.
Couldn't load pickup availability
- Cushion Shape Signet Ring
- Natural Black Onyx
- 14mm x 12mm
- 925 Sterling Silver, plated in Gold
- Handmade, Solid & Heavyweight
- Hallmarked for authenticity
- This ring weighs 12 grams
Handcrafted from the finest precious metals, our signet rings are made to last a lifetime. Every piece is backed by our quality guarantee for complete peace of mind.
Every gemstone is carefully selected for its colour, character, and natural beauty. We choose each stone individually to complement the design of your signet ring, with a focus on quality, richness of tone, and overall appearance. As gemstones are naturally formed, subtle variations in colour, pattern, and inclusions make every piece truly unique.
Built for daily wear. Shower, train, and travel without worrying about tarnishing or fading.
Made from high-quality materials that are nickel-free and suitable for sensitive skin.
All sterling silver and solid gold pieces are hallmarked to verify their authenticity and quality.
Enjoy complimentary cleaning and polishing for life, helping to keep your jewellery looking as beautiful as the day you received it. Terms & Conditions apply.
All signet rings are custom made to your size and specifications. Completed pieces are shipped within 2-3 weeks. Please allow up to 4 weeks for any customisation.
Invictus offers complimentary shipping and returns on your order, exclusions apply.
For more information, please consult our Shipping & Delivery page.
For cleaning and care instructions, we advise you to carefully read the information card inside your package. For any questions or concerns, please visit our Care Guide or contact us.

Complimentary Delivery
All taxes and customs duties included
Lifetime Maintenance
Complimentary cleaning and polishing for life
Free Returns
Returns within 14 days. T's & C's apply
Hallmarked
Independently hallmarked to verify authenticity and value
Find your perfect fit using our ring size conversion chart.
UK sizing also applies to Ireland, Australia, New Zealand and South Africa. Measurements are approximate. If between sizes, we recommend choosing the larger size.
| Finger Circumference Finger Circ. | Ring Diameter Ring Dia. | UK / AU / NZ / SA UK | US / Canada US | Europe EU |
|---|---|---|---|---|
| 44.2 mm | 14.1 mm | F | 3 | 44 |
| 45.5 mm | 14.5 mm | G | 3.5 | 45 |
| 46.8 mm | 14.9 mm | H | 4 | 46.5 |
| 48.0 mm | 15.3 mm | I | 4.5 | 47.5 |
| 48.7 mm | 15.5 mm | J | 4.75 | 48 |
| 50.6 mm | 16.1 mm | K | 5.5 | 50 |
| 51.9 mm | 16.5 mm | L | 6 | 52 |
| 53.1 mm | 16.9 mm | M | 6.5 | 53 |
| 54.4 mm | 17.3 mm | N | 7 | 54.5 |
| 55.7 mm | 17.7 mm | O | 7.5 | 56 |
| 57.0 mm | 18.1 mm | P | 8 | 57.5 |
| 58.3 mm | 18.5 mm | Q | 8.5 | 58.5 |
| 59.5 mm | 18.9 mm | R | 9 | 60 |
| 60.8 mm | 19.4 mm | S | 9.5 | 61 |
| 62.1 mm | 19.8 mm | T | 10 | 62.5 |
| 63.4 mm | 20.2 mm | U | 10.5 | 64 |
| 64.6 mm | 20.6 mm | V | 11 | 65 |
| 66.0 mm | 21.0 mm | W | 11.5 | 66.5 |
| 67.2 mm | 21.4 mm | X | 12 | 68 |
| 68.5 mm | 21.8 mm | Y | 12.5 | 69 |
| 69.1 mm | 22.0 mm | Z | 12.75 | 70 |
| 70.4 mm | 22.4 mm | Z + 1 | 13 | 71 |
| 71.7 mm | 22.8 mm | Z + 2 | 13.5 | 72 |
Measure an existing ring:
Take a ring that fits your chosen finger and measure the inside diameter in millimetres, from one inner edge to the other. Find this measurement in the diameter column of our size guide to identify your ring size.
Measure your finger:
Wrap a piece of string snugly around the base of your finger and mark where the ends meet. Lay the string flat and measure its length in millimetres. Match this measurement to the circumference column of our size guide to find your size.
If you're still not sure, reach out and we'll send you a free ring sizer!
Join our community and be the first to know about new releases, limited editions and exclusive offers.