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The Roma radiant-cut lab-grown diamond signet ring in 18K yellow gold, front view
The Roma radiant-cut lab-grown diamond signet ring in 18K yellow gold, side profile
The Roma radiant-cut lab-grown diamond signet ring in 18K yellow gold, side view
The Roma radiant-cut lab-grown diamond signet ring in 18K yellow gold, back view
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Roma

$6,100.00
Band Material
18K Gold
Carat Size
1ct

Description

The Roma is a lab-grown diamond signet ring: the shape of a signet, the substance of fine jewellery, the stone a radiant cut. Wide at the top, tapering toward the band, with a bold radiant-cut stone flush in the face. It wears as a statement piece or an engagement ring, depending entirely on what you want it to mean. Handcrafted to order in solid 18K gold or platinum.

The radiant cut was designed to combine the brilliance of a round diamond with the shape of an emerald cut, producing a rectangular stone with brilliant-cut facets. In a signet setting the result is a ring with strong presence and exceptional light performance.

Specifications

  • Diamond: Lab-grown radiant cut
  • Certification: Centre stone IGI certified. IGI certifies stones of one carat and up.
  • Setting: Signet-style bezel or claw
  • Metal: 18K yellow, white or rose gold, or 950 platinum
  • Carat: 1ct to 5ct, chosen at checkout
  • Engraving: Complimentary
  • Made to order: Handcrafted in approximately six weeks
  • Designed in Australia

Lab-grown diamond signet rings

Signet rings have had a significant revival as engagement rings and statement jewellery. The Roma brings lab-grown diamond quality to a format that wears differently to any traditional solitaire. Available in 18K yellow gold, white gold, rose gold and platinum. From $6,100 AUD.

The radiant cut in a signet setting

The radiant cut was developed to bring brilliant-cut faceting to rectangular and square shapes. The result is a stone with the outline of an emerald cut but the fire of a round diamond. The signet frame holds it flat against the finger, producing a wide, bold face that reads as a serious piece of fine jewellery.

Signet rings as engagement rings

Not every engagement ring needs to be a solitaire with a raised stone. The Roma belongs to a growing category drawing from fine jewellery traditions beyond the classic prong-set diamond: chunky, architectural, and designed to be worn and kept rather than put away. Browse our solitaire engagement rings, emerald-cut rings, and 18K yellow gold engagement rings.

Details

Every Una piece is made to order, crafted by skilled artisans with precision and care in 18K gold or platinum. Our lab-grown diamonds are chemically and optically identical to mined diamonds, and every piece comes with IGI certification documentation.

Your piece arrives beautifully packaged with free insured shipping to every country we deliver to, and is covered by our three-year warranty against manufacturing defects. Whether it's an engagement ring or a gift, it's made to be worn and treasured.
Item is in stock

Made to order, just for you

Free insured shipping to every country we deliver to

Three-year warranty

18K gold or platinum, IGI-certified diamonds

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Need styling help?

Email our team at hello@unadiamond.com and we'll help you find your perfect ring.

Roma

$6,100.00

•

Free insured shipping to every country we deliver to

•

New customers save 10% with code GET10
Care Instructions

How do I take care of my jewellery?

18K gold and platinum

Soak your ring in warm water with a little mild soap, then gently brush around the setting and behind the stone with a soft toothbrush. Rinse and pat dry with a lint-free cloth. We recommend removing your ring for the gym, gardening and swimming.

Lab-grown diamonds

Lab-grown diamonds are just as hard and durable as mined diamonds, but lotions and everyday oils can dull their sparkle. A gentle clean every few weeks keeps them bright.

Do you have a warranty?

Yes. Every Una Diamond piece is covered by our three-year warranty against manufacturing defects in materials or workmanship, including the setting and metalwork. To make a claim, contact us with your order number and a short description of the issue.

Please note: the warranty doesn't cover wear and tear, accidents or misuse, loss or theft, or changes in sizing or personal preference.

How should I store my ring?

Keep your ring in its own soft pouch or a lined jewellery box when you're not wearing it. Diamonds can scratch gold, platinum and even other diamonds, so giving each piece its own space keeps everything looking its best.

Do you create custom pieces?

Yes. Every Una ring is made to order, and you can design your own with our ring builder. Choose your band style, metal, stone shape, carat and setting, then add personal touches like engraving, a hidden halo or a secret gemstone in the band. We'll share a 3D CAD rendering for you to review and refine before your ring is crafted. Have a question about your design? Get in touch. Would you like to customise one of our designs? Add your requests to the notes on your order and our team will help bring them to life.

Shipping & Returns

Shipping

Every Una piece is made to order, so please allow around six weeks for crafting. Once it's ready, our team gives it a final quality check in Australia before dispatch. Shipping is free and insured to every country we deliver to, and every order is sent by tracked courier with a signature required on delivery. Delivery typically takes 2-5 business days within Australia and 5-10 business days internationally, subject to customs. Have a date in mind? Let us know before you order and we'll do everything we can to help.

Returns

Every Una piece is made to order just for you, so we're unable to accept returns or exchanges. Each piece is covered by our three-year warranty against manufacturing defects. View our returns and warranty policy.

Order tracking

We'll email you when your piece goes into production, and again with a tracking number once it's on its way. If it hasn't arrived, please check your junk folder.

Get in touch

If you have any questions about your order, please contact us. You can also email our team directly at hello@unadiamond.com.

Materials & Craftsmanship
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Lab-grown diamonds

Una diamonds are grown in a controlled laboratory environment and are chemically and optically identical to mined diamonds, with the same brilliance, fire and durability. Every piece comes with certification documentation from IGI.

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Craftsmanship

Every Una piece is made to order. Once you've approved your 3D CAD design, our skilled artisans craft your ring in 18K gold or platinum with precision and care, and our team gives it a final quality check before it's sent to you.

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Considered choices

We chose lab-grown diamonds for their beauty and for the respect they show our planet, with no compromise on quality or integrity. Una is proudly female-founded, and we believe luxury should align with what matters most: ethics, sustainability and individuality.

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Design your own ring

Choose your stone, metal and setting in our ring builder, then add personal touches like engraving.

Each Una diamond is grown with care and crafted to order, just for you.

Build your ring
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Find your ring size

Every ring is made to order, so getting the fit right matters

Size guide
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Lab-grown diamonds, explained

Quality, certification and value, explained simply

Learn more
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