Men's jewellery · Rings · Signet ring
Axiom Octagon Men's Signet Ring with Electric Blue Lab Diamond
A bold men’s signet ring in brushed platinum, cut with architectural weight and a vivid octagonal blue lab-grown diamond at its centre. A polished yellow gold inner edge gives the piece a private warmth, while hidden baguette onyx inlays along the inner band add a quiet detail discovered only in motion.
Available to order — price on enquiry
Answer a few questions and our studio will prepare a tailored quote based on your preferred metal, stones, size and budget.
Made to order. Each piece begins when you do — typically 4 to 6 weeks from confirmation. Stone availability is confirmed by the studio before any work begins.
- Approved by you before we craft it — we share a design first
- Lifetime aftercare & resizing at our Hatton Garden atelier
- Worldwide delivery, fully insured and tracked
- Handcrafted in Hatton Garden by the London Gold Centre studio
Details
- Category
- Men's jewellery, Rings, Signet ring
- Lead time
- 4 to 6 weeks
- Made to order
- Yes — handcrafted in our atelier
How this works
You stay in control. Before manufacturing begins.
Once your order is placed, we don't go straight into manufacturing. The atelier first prepares everything you need to be sure — and nothing is made until you approve it.
A full CAD design
A precise 3D render showing the exact piece we will make for you.
The complete specifications
Stones, metals, sizes, settings and finish — set out clearly so nothing is left to interpretation.
Photographs of the actual stones
And, where useful, short videos — so you see the exact stones we will set, not stock images.
Manufacturing only begins after you have reviewed all of this and confirmed you are happy. Your piece is made on your approval, not before.
Worldwide delivery
Crafted in London. Sent wherever you are.
We work from our atelier in Hatton Garden — but the stones, the metals, the inspiration and the craftsmanship behind each piece can come together from all over the world. In a way, the piece you wear carries a little of the world with it.
Secure, insured delivery
Every order is sent fully insured by carriers we trust, with tracking from the moment your piece leaves the atelier — so you know exactly where it is, every step of the way.
A note on local taxes
For deliveries outside the UK, import duty, customs charges or local VAT may apply at the destination. These are set by the country you're in and are the customer's responsibility — but we'll happily guide you through what to expect, and our delivery partner will help with the formalities so nothing comes as a surprise.
About this piece
The Axiom Octagon is a made-to-order Studio Product designed as a personal signet with presence rather than ornament. Its broad platinum form is deliberately masculine: clean planes, a strong bezel, and a substantial signet silhouette built around a 1.75ct fancy vivid electric blue lab-grown diamond in an octagonal cut.
The contrast is precise. A brushed platinum exterior gives the ring a calm, tactile surface, while the polished yellow gold inner edge sits closer to the wearer as a warmer private detail. Small sapphire accents are kept secondary, integrated with restraint so the electric blue centre stone remains the clear focus.
Hidden baguette black onyx inlays are set into a recessed channel along the inner edge of the band, visible only when the ring is tilted. It is a considered detail for a piece intended to feel personal: architectural on the hand, discreet in its refinements, and made to order with our studio reviewing the final proportions, stone details and setting approach before production.
Specifications
- Studio Product: made to order
- Product type: men's signet ring
- Primary metal: platinum
- Secondary metal: yellow gold inner edge detail
- Finish: brushed platinum exterior with polished yellow gold contrast
- Centre stone: 1.75ct fancy vivid electric blue lab-grown diamond
- Centre stone shape: octagonal
- Setting direction: bold bezel setting for the centre stone
- Accent stones: sapphire, 0.03ct each, kept secondary to the centre stone
- Hidden detail: natural black baguette onyx, 0.05ct total, recessed along the inner band edge
- Design language: architectural, substantial, masculine signet profile
- Recommended band proportion: approximately 4-8mm, to be refined to ring size and stone dimensions
- No black rhodium or black-rhodium finish specified
- Additional stone: Hidden detail stone Onyx — 0.05ct total
This is a made-to-order Studio Product, available on backorder. Estimated manufacturing time is 4 to 6 weeks from order. The price and image shown reflect the shown configuration; our studio reviews the metal, stone availability and making details before production.
Metals & stones in this piece
Platinum, a strong and durable metal, is perfectly complemented by the warm, elegant tones of rose gold. The brushed finish on these metals will gradually wear to a soft sheen over time, developing a beautiful patina that reflects the piece's history. Lab-grown diamonds, with their exceptional brilliance and fire, are a stunning match for these metals. They possess the same physical and optical properties as natural diamonds but are more environmentally friendly. The combination of platinum, rose gold, and lab-grown diamonds results in a piece of jewellery that is not only visually striking but also remarkably resilient, capable of withstanding the tests of daily wear with minimal maintenance. As the brushed finish matures, it will continue to exude a sense of sophistication and timeless style.
Caring for this piece
To keep your platinum and rose gold jewellery with lab-grown diamonds looking its best, clean it regularly with mild soap and warm water. A soft-bristled toothbrush can be used to gently remove any debris. Avoid exposing your jewellery to harsh chemicals or extreme temperatures. When not worn, store your piece separately in a soft pouch or box to prevent scratching. Regular polishing by a professional jeweller can help maintain the brushed finish, ensuring your jewellery remains a treasured possession for years to come.
Made yours
Customise this design.
Try the piece in different metals or stones, then request a personalised quote when you find the version you would wear. The studio shapes the variation with you.
Made to order
Nothing is made before it is yours.
Every piece begins when you do. We confirm every detail — including stone availability — before a single setting is touched. In the rare case a stone cannot be sourced, we will contact you straight away and offer an honest alternative or a full refund.
From here
Four quiet steps to your piece.
Discover
You have found a piece you love — or one to begin from.
Refine
Adjust the metal, the stone, the proportions — together with our studio.
Approve
We confirm every detail, including stone availability, before any work begins.
Craft
Each piece is handcrafted to order. Typically 4 to 6 weeks.
Questions about this design
Real answers from the studio.
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