The Roma Radiant-Cut Signet Diamond Ring – Lab-Grown | 18K Gold or Platinum
Made for you, not a shelf
IGI Certified Diamond
Ready in ~6 weeks
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Behind the piece
The Roma Radiant-Cut Signet Diamond Ring – Lab-Grown | 18K Gold or Platinum
Every Una ring begins with a clear point of view and a commitment to craft. Yours is no exception.
The Roma is a lab-grown diamond signet ring — the shape of a signet, the substance of fine jewellery, the stone of a radiant-cut lab-grown diamond. 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. Made by hand to order in solid 18K gold or platinum.
The radiant cut was designed specifically 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. IGI certified lab-grown radiant-cut diamond, all grades confirmed.
Specifications
- Diamond: Lab-grown radiant cut, IGI certified
- 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 in Australia
Signet rings have experienced 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 and sparkle of a round diamond. In a signet setting, the radiant cut creates a ring with strong visual impact and exceptional light performance. The signet frame holds the stone flat against the finger, producing a wide, bold face that reads as a serious piece of fine jewellery. The Roma wears as confidently as any signet ring made, but with a lab-grown diamond at the centre.
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 of engagement rings that draw from fine jewellery traditions beyond the classic prong-set diamond — chunky, architectural, and designed to be worn and kept rather than put away. If you want an engagement ring that is also a lifetime piece, the signet format delivers. Browse our solitaire engagement rings, emerald-cut rings, and 18K yellow gold engagement rings for more styles.
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Our signature pieces
From delicate pavé bands to bold diamond staples, each Una design begins with a clear point of view: modern, refined, and made to be worn every day. Every piece is crafted with lab-grown diamonds, ensuring beauty with purpose.
una x forever projects
Designed with care, backed by purpose
We’ve partnered with Forever Projects as part of our 1% Pledge. That means every single Una Diamond purchase contributes to life-changing programs for mothers and children.